Fellatio (also known as fellation,[1] and in slang as blowjob, BJ, giving head, or sucking off[2]) is an oral sex act involving the use of the mouth or throat, usually performed by a person on the penis of another person. If performed on oneself, the act is called autofellatio.[3][4] Oral stimulation of the scrotum may also be termed fellatio,[5][6] or colloquially as teabagging.[7]