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1.
Like a twat but found between the buttocks.
"MATE I FOCKING RAMMED HER IN THE BACKTWAT AND SHE LOVED IT"

"My backtwat is sore from all that ramming"

"Josh rammed an empty beer bottle up my backtwat and I had to get it removed at A&E"
by Tommycopter February 01, 2009
 
2.
opposite of front bum ie female anus
by jonny the rocker September 13, 2003