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1.
Alternate saying for "count it bitch"
Oh shit i just hit a 3! YACKUM!
by Jimbo1990 December 04, 2010
 
2.
British slang terms meaning nonsence
"That's a load of yackum!"
by BritishSlang<3 November 26, 2011
 
3.
Throwing up. Whether after drinking too much or in the morning after taking exstacy.
Dude, you better stop drinking before you yackums!
by Kyle Fisher October 31, 2007