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1.
Actually a brand of audio equipment ranging from Microphones to cables... but sprung to fame in a chat room as a random spoutage that quickly became popular amongst about... 3 people.

Leem is pervasive, leem is everywhere. Leem will turn your system of beliefs upsidedown.
Leem.

Leeeeem!

Yeah, leem.
by Miek July 10, 2004
 
2.
Leem is the opposite of Reem The King-Of-The-Leem is also the Anti-Zeem the one destined to destroy everyone who is cool.
That guy thinks he's reem... but he's totally leem.
by kingofthezeem January 24, 2012
 
3.
A term derived from Leet. Used to claim ones absolute superiority over the other in every way shape or form. It is also an anagram of Meel.
l33t dude: i just pwned him
his friend: yea your da shiiieet
l33t dude: yea, i'm leem
by Gullible December 04, 2003