to flirt with someone, try to date someone, hook up with someone, or actually ess dees.
Justin was essin dees with Jeannie.
Jeannie was essin dees back.
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to have one's wang sucked, from (S)uck (M)y (D)ick
Hilary: William, who is Monica?
Bill: Oh Mon? Just some broad that was essin ma dee
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