like you're totally annoyed at this one person, just because of the fact that they feel fly, or that they were totally macking "this one time..." and they're just not. they totally have no game and just really fail at stuff that they describe. they're usually not mackin' at all, so you need to see it to believe it, but they probably won't show you. so they're being a jamhacky.

(noun) A successful type of theft which results in an acceptable, impressive and rewarding payday for the protagonist.