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26.
"To suck" or "you suck" is derived from, or is a shortened form of "to suck dick" or "you suck dick." In effect, it is the equivalent of saying "that's gay" or "you're gay." (You suck dick, so therefore, you must be gay.) This, in turn, comes from the assumption that homosexuality is "wrong" or "bad." Therefore, if something "sucks" it is "bad."

Isn't it strange how widely accepted the term is? Everytime you hear someone say "that sucks" on TV, they are essentially saying "that sucks dick."
Lil' Timmy: Dave, you suck at hopescotch.
Dave: Frig off, Timmy - you are so gay.
by Time4SumAksion February 28, 2005
 
1.
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 couldn't play very well then they would say that he was "Sucking" on that horn. That's where the term "Suck" as being something bad came from.
He plays that horn so poorly that he must be sucking on it.

He doesn't blow, he sucks.
by Don Kotas August 06, 2004
 
2.
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.
Damn you suck at sports.
by iono December 03, 2004
 
3.
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.
1)Abby: I can't go to homecoming!
Rebecca: Wow. That sucks.

2)Camille sucks Mark's cock every night.
by Yours Truly June 22, 2004
 
4.
when something is a bit downheartening or lame
Boy1- Your mum only gave me a fiver last night.
Boy2- That sucks!
by Josephino January 13, 2007
 
5.
What you life is by being on Urban Dictionary all the time and looking up words like 'sucks' when you obviously know what it means, your just looking for a cheap thrill.
Teacher- "So, Billy, what did you do over summer vacation?
Billy- "Went on Urban Dictionary and looked up words like 'sucks' and 'dick'."
by GetOuttaHereKids! November 03, 2009
 
6.
is not good. is, in fact, bad.
That new Yahoo Instant Messenger background sucks.
by slumgullion June 19, 2005
 
7.
to be really really crappy
That team last night really sucked. They just plain sucked. I've seen teams suck before, but they were the suckiest buncha sucks that ever sucked.
by Jog DMC December 08, 2003