(obsolete, idiomatic, slang) I'm awake; I'm alert; I know what's happening.

Alternative spelling of skullcap

A depiction of a human skull and two crossed femurs (thighbones), a symbol of death traditionally used on the Jolly Roger pirate flag, but now as a warning of toxicity or other dangers.

(obsolete) a hot-head

(vulgar, slang) To actively sexually penetrate someone's mouth; to have vigorous oral sex. / (vulgar, slang) To sexually penetrate someone's eye socket.

an instance of skull-fucking

Alternative spelling of skull-fuck

(pathology) craniosynostosis

plural of skull cap

(vulgar, slang) Aggressive deepthroat fellatio.