This is the point of contact from the coxix tho the anus of one's buttocks. As the buttocks can be spread apart, the contact forms a 'crease'. This crease in in one's buttocks is known as the 'Batty Crease'. It is a colloquialism that can be used as a noun or an adjective.
'You're a dirrrty batty crease bitch!'(in terms of adjective) 'Yo bitch's batty crease is masssive man!'(noun)
by Me's gonna beat up dem batty mc's at the top. Ba July 03, 2003
The point at which ones thighs meet at the back of the body, usually referred to as the buttocks. The "batty crease" is therefore the crack in ones buttocks
by MC Barebreeze, MC Bareflex, MC Barefassy March 06, 2003
by ur mom April 10, 2003
The most unsensitive part of the body situated on the back above the legs below the spine. It is unsensitve unless your attacked by the sh*ts
by Joel 'batty crease' Minsky September 07, 2003