Verb: To swing your penis with the same motion and force that one would swing a baseball bat into a girl's face. At the same time, one must ejaculate whilst the penis strikes the girl's face, leaving a thick glaze of sperm on her cheek.
"Adam: Hey, what'd Jess and you do last night?
Luke: She was using too much teeth, so I slagged her to teach her a lesson."
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