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5.
A sub-catagory of hacker.

Someone who hacks into private computer systems and steals data, then releases them publically.
Hey, did you hear that some leaker got the Half Life 2 source code?
by Bluehawk July 16, 2004
 
1.
leaker n. Aus. A sexually alluring female, that is to say, one who "has holes that need to be plugged up".
O. was a leaker and would fuck anything that would help her into a job. She was a leaker who had a penchant for back door love.
by Bromp March 14, 2010
 
2.
The first person to leave his group of friends and go home during a fun late night out. This person will often try and slip out (i.e. leak out) unnoticed to avoid the embarrassment and shame of being the first to leave his buddies.
Man, it's only 10 o'clock and there goes Lamont. He is such a leaker.

by Rick V August 03, 2007
 
3.
A man that shot lots of precum when horny.
Dan is a leaker, look to the wet spot on his briefs!
by John J Joe April 25, 2006
 
4.
A guy who constantly leaks cum when horny.
David is such a leaker.
by chevygurl25 March 29, 2009
 
6.
a person male who needs a tube to shat
adam d wolf!
by ian layla & hilary January 12, 2004