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1.
n. A word used to insult somebody, means basically the same as kunckle head. Knuckle-head is to knuckles in your head, as chuckle-butt is to chuckles in your butt. Can also mean one who farts a lot.
Example 1-
Daughter who is texting her friend on her cell: Daddy, my friend just said i was stupid!
Father: Well, call her a chuckle-butt

Example 2-
Girl-Ew, Chris is such a chuckle-butt
Other girl-Tell me about it. Earlier in math class he blew one right in my face!
by The Bombdiggietest December 23, 2006
 
2.
Wide-load/Overall Large Ass dude that jiggles when he laughs like Santa Claus but year-round.
Greg: YO Chuckle Butt stop fucking laughing so hard on the couch you are gonna break the gears we can't concentrate on the damn game!

Ryan(Chuckle Butt): Shut the fuck up Greg your girlfriend's fatter than me and you let her bounce up and down on your bed.
by Greg Nicers December 24, 2010
 
3.
An expression used in frustration directed to an unknown person.

Synonmyms: retard, buttmunch, loser, lame-o, etc.
"Who's this CHUCKLEBUTT?!"
by Margaret Kammer October 04, 2006