Suck

[Tina]

Not good. Bad.

The early Jazz musicians would say that a guy could really Blow if he had a good sound when playing the horn. If he couldnt play very well then they would say that he was Sucking on that horn. Thats where the term Suck as being something bad came from.

[Tina]

If you suck, it generally means you have no skill and/or talent.

Oddly enoguh, even though suck is the opposite of blow, blow is an insult also.

[Britney]

1)A term meaning bad or not good

2)To put ones mouth over another object and pull air back. Often done in sexual ways.

[Luis Fok]

to be really really crappy

[Dave Paprocki]

(for those under 30 years old) An intransitive verb indicating a negative state of affairs. Could be poor performance, bad weather, illness, general dislike, or any of innumerable negative thoughts.
(for those over 30 years old) Always a transitive verb. Colloquially used as shorthand for [suck dick] with noun [dick] understood. Synonymous with [blow] and [bite]. Used as an insult; indicates homosexuality.

[Jason Yan]

No good.