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2.
A person whos speech is unrecognizable. Someone who sounds like they have a mouth full of marbles.
The guy who gave me directions is a marble gargler. I have no clue what he said.
by tinyelvis July 05, 2007
 
1.
someone who performs fellatio. as an insult, similar to "cocksucker". another way of calling a dude gay.
"hey, dude"

"hey, what's up, marble gargler"
by ravenflesh July 10, 2008