De bobe don quench

Huh? Some expressions take getting used to, in fact this is one of my favorites. Quench means broken irreparably, "don quench" would be past tense. "Bobe" is of course what we would refer to as a light bulb. In other words, the light bulb is out. As opposed to "moto don die" which means the motor has broken down but can probably be repaired. Or when something is "spoiled" it's not just a rotten piece of fruit, but can mean something broken as well, like "my tyre is spoiled". In a related vein, "should I off the washer?" means not to kill it, just to turn it off, like when I want to take a shower and the water pressure is low, then please "off the washer".

Some of my other favorites:

Chop is of course food, or the act of eating or consuming. A "chop bar" is a local restaurant, probably not where you would want to eat. Or used as a verb as in "He go chop all the money" referring to a corrupt official. Then "small chop" of course means snack. Oftentimes an invitation that's not for a complete meal will include this term.
If a store doesn't have something, then it's "finished".
Therefore a job cannot be finished, but it might be completed, or it will be completed "anytime from now".
If you don't understand someone, tell them "I can't hear you".
When someone walks away and says "I'm coming" it can be a bit confusing. It actually means that they will return at some time in the future, it might be in 5 minutes or "any time from now", meaning, well, anytime.
If you are required to wait for something, you might be told to "please exercise your patience". So I guess you will.
"On time" means early, as in "I finish my work so I go leave on time today"

Some other definitions

Expired - like my driver said to me the other day when I called him after lunch break, "Has my time expired?"
Very well - properly, correctly - as in "The pilot must calculate his fuel very well". Reported after a recent airplane crash.
Fairly used - A product that still has useful life remaining. As in a "fairly used okada"

The locals love acronyms and the longer the better.

FG - Federal Government
LG - Local Government, wherever that happens to be
NNPC - Nigerian National Petroleum Corporation
EFCC - Economic and Financial Crimes Commision
LAWMA - Lagos Waste Management Authority
NUPENG - National Union of Petroleum and Natural Gas Workers
PENGASSAN - Petroleum and Natural Gas Senior Staff Association of Nigeria

And a few more that defy classification.

Four-o-four (404) - slang for dog meat, comparing the speed of a dog to the previously popular Peugeot 404. Legs can be referred to as "tyres", "headlights" being the whole head with eyeballs.
One thousand and four (1004) - A large apartment complex built for government workers that was emptied out when the FG moved from Lagos to Abuja. Still empty today, with limited signs of any progress in the supposed refurbishment. As in - "It took me an hour to 1004, and I'm still stuck at the Law School". Named after the number of apartments.
Sentencing - Instant justice dispensed at police checkpoints. Ranges from a small dash to large fines or even assassination.
419 - fraud. For example, internet come ons or selling someone else's property, named after section number in criminal code.
Trafficator - automobile direction indicator, what we would call a blinker. Yet another reason for the traffic police to demand a bribe, recently reported at a going rate of N50,000.

Better study up, or you'll be easily spotted as "fresh fish". (Newcomer)