v. the act of inhaling vigorously.
n. A person who is innately lame.

Definition 1-- Is bad at something
Definition 2-- Is overall unpleasant

Short for suck dick, referring to mid-to-late 20th century ridiculing of a person who would suck dick, in other words women and especially gays. It was used to describe (in mainly humorous ways at the time) anything that was unworthy, regretful, or dissatisfying.

Today suck is used in more serious tones and refers to anything considered disappointing.

"sucks" is used when a person really annoys you so much.

to slerp on

to suck or slurp with pleasure

A common insult, often abbreviated to sux on the interweb, used when describing a bad performance.

Mistakenly thought to refer to a blow-job, "... sucks" refers to the fact that the dutch noticed that certain boats "sucked" water and this would result in a little wave at the back of the boat. The larger the wave, the slower the boat would go; and at a time where there was a big issue with pirates and other naval threats, the fact that a boat "sucked" meant that it performed badly.