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1.
The annoying practice of begging people for something, usually money. Usually when someone scabs they will repeatedly ask a passer by (especally someone they know by name) for the thing they are after until they give in.
I want chocolate. I think I'll start scabbing for money to buy some.
by miss scabber May 06, 2009
 
2.
Furiously masturbating for prolonged periods of time. The penis skin may be so traumatized that scabs begin to form.
"Has Andrew come out of his room yet today?"
"Nah, he's been in there all day scabbing it up."
by Jon Ralfio June 02, 2014