n. 1 Post-Coital Expulsion from an orifice esp. vaginal.
v. 1 ('ing) an act of one's kegels to expel a foreign substance.
1 "the poor boy got butterguck all over his stomach and in his bellybutton when his girlfriend lifted off him after he came"
2 "after the premature climax of her partner, the actress went off set to butterguck before the second take."