arse-antlers 

a tattoo just above the buttocks, having a central section and curving extensions on each side

She bent over and revealed the arse-antlers that were hidden under her shirt.

arse-antlers by Peter Michael (Canada) March 19, 2008

Arse Antler 

The Tatoo above ones Backside giving the illusion the the Buttocks have Atlers growing from them

Your bottom has arse antlers

Arse Antler by McKenzie Kerr June 20, 2008