1. Refers to a specific someone known as "She Who (any adjective beginning with the letter "A") Raises Cock"
2. Also, when not capitalized, refers to anyone who is into really weird, kinky, and sometimes nasty sex.
As a verb:
3. To engage in a filthy sexual act.
And as an adverb, adjective, etc, means anything along these lines.
2. That swarc is kind of scary in bed.
3. I can't wait to swarc her so hard tonight.