something that really sucks.

also a quote from a vine where a black man just yells

Something that just plain sucks, or isn't cool at all. Lame.

1) Lame, sorry ass, aint even legit

2) To Jerk off

1. To be of low or dubious quality. Origin: comes from 'whacky', which evolved to 'whacked' or 'whacked out'. Eventually shortened to 'wack'. The 'h' is usually dropped to differentiate the meaning from 'whack', which is to hit something hard or, kill (old wise guy terminology).

something that sucks horribly; stupid; fake; talentless

Wack - crap, shitty, no good.

A word used verbally by those who see themselves and their peers as gangster.
For someone to define something as wack, theyre saying its shit.

Hip hop artists (MCs, DJs, B-boys, etc) who are typically aspiring and full of themselves, yet their style is an insult to real hip hop because it (1) copies another artist's style, (2) is mainly driven by commercial aspirations, or (3) is basically incompetent with no hope of improving. Wack = weakly executed flashy moves in place of true substance.