Top Definition
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
1 more definition
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

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