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1.
The sound made by sucking hard on a cock, while giving a blow job.

Can also be used if you want to give a blow job to someone and you want to be discrete
Clare wanted to suck his cock hard and was desparate to watch him cum while yom yom'ing on his cock

As she sucked hard on my cock, all I could hear was yom yom yom
by MonkeyBoots December 23, 2011
 
2.
Short for moulinyam which is Italian for eggplant. What Italians call blacks.
That neighborhood is loaded with yom-yoms.
by Vitorelli December 06, 2007
 
3.
another word for people of lower intelligence who upon repeat performances still make the same mistakes! also known as re-re's, retards, and stupid motherfuckers!! also one who has had their head in a bong for too long and become a yom-yom!
yo if craig keeps drooling on himself and putting the round peg in the square hole he is such a yom-yom!
by Dan Grzebein Jr October 05, 2005
 
4.
people of under average intelligence!! also called retards, re-re's, and window lickers!
no you friggin yom-yom. thats paste not cookie dough!!! or you group of yom-yoms don't eat sand it's for castle building not, not show and tell!!
by Dan Grzebein Jr October 04, 2005