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2.
Someone who uses the phrase "Lol" too often, and/or doesn't really laugh.
Poodle132: I went to the store yesterday and I fell.
Narwal6: LOLOLOLOLOLOLOlOLOLOLOLOLoOLOLoLOoLoLOLOL
Poodle132: It wasn't really that funny.

Narwal6: LOL
Poodle132: You Lol Monster.
by Wumpudu September 03, 2010
 
1.
A LOLMONSTER is someone who is very funny and tells many jokes. He/She is always the funniest person in the room and can make anyone laugh at anytime.
Bob: Dude, here comes the LOLMONSTER
LOLMONSTER: Hey guys, whats up?
Everyone: HAHAHAH, you're hilarious.
by chunky luhv 37 May 03, 2010
 
3.
Something you say when you hear a joke that is utterly and insanely hilarious. An awesome word used by only awesome people. If you make fun of someone who uses this word, you are lame because it is the coolest word in the universe.
Boy: What is the difference between a smart blonde and a UFO?

Brunette: I dont know , tell me.

Boy: There have been sightings of UFOs.

Brunette: OMG.... lolmonster!!! such an epic joke!!
by MarilenaAwesome March 12, 2011