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1.
The yellowish slime left in the crotch of a girl's panties usually due to over-horniess or a genital disorder.
Sarah always had a bright yellow yolker waiting for me in her underpants
by donniel May 20, 2006
 
2.
One who masturbates constantly.
used as an insult
"Hey you going to pro with Jeff?"
"No he's such a yolker..."
by ckyuteee March 18, 2009