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1.
Verb. To yelf is to prod someone in the small of the back with a turgid penis, whilst laying in bed together.

Often this is a hopeful, unspoken gesture intended to instigate sexual gratification, but it may also be a side-effect of morning glory.
Christopher casually yelfed the girl he had hooked up with the previous evening, but she was clearly more interested in sleep than morning sex.
Por Paolov 28 de marzo de 2008
 
2.
he whom pnws noods not very well
"Yelf u really suck at pwning noods"
Por jamesy boi 23 de septiembre de 2007