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1.
The crease in your trousers reveling your boner or normal penis.
"Jesus Christ, check out him hes got a major bats foot in those trousers"
by Jacob_you know who November 02, 2011
 
2.
When your trousers make it appear as though you have an erection.
"You've got a bit of bat's foot going on there."
by Nelson Mandella!!!!!!!!!!!!!!! August 18, 2011