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
av donniel 20. mai 2006
One who masturbates constantly.
used as an insult
"Hey you going to pro with Jeff?"
"No he's such a yolker..."
av ckyuteee 18. mars 2009

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