The technique of using only one slice of bread for a sandwhich. User would place sandwich filling (ex: ham or peanut putter) on single slice of bread and the proceed to fold slice of bread in half vertically. Or bend the bread back, hence bend back.
"I only had one slice of bread so I made a bend-back sandwhich bitch!"
"Want a turkey sandwich?"
"I'm not really hungry enough to eat a whole sandwich. How about just a bendback?"
"Oh look, your Daddy made you guys jelly bendbacks for lunch."
The Craig positions themselves on all fours and then from behind the woman starts to exstaticly rim the Crag whilst bending his member backwards betwen his legs to face her face and jacking it off towards her chin , thus the craig bend back