by Nimic March 11, 2006
by Dave Butler May 31, 2006
A ringlike muscle that normally maintains constriction of a body passage or orifice and that relaxes as required by normal physiological functioning.
by mastershake211 March 04, 2006
Circular muscle in the anus; can be developed in gay anal sex receivers to clamp down on the penis and give pleasure to the giver, often making them ejaculate, depending on the skill of the receiver.
Peter Goesinya always like to fuck Chuck because Chuck's sphincter muscle had been well trained and was always used at just the right time.
by Richard Black April 12, 2005
What people sometmes scream while attacking their friends from behind, shoving their fingers in their friends buttholes.
by The Numba One Solja October 29, 2006
by Damien Hogg December 05, 2006