Definitions by Lame.

Asterisk 

Not just a symbol(*). But a reference to one's sphincter, specifically the anus.

Notably used by Kurt Vonnegut in his novel Breakfast of Champions. Also appears in the Dresden Dolls song, The Kill.

The infamous Asterisk:

http://www.vonnegut.com/images/art/aug06/01backdoor.jpg

Asterisk by Lame. January 7, 2009