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The act of turning your boxers, pants, or underwear backwards so the opening is facing behind you.
Hey man i forgot my swimming suit. Ahh don't worry just backdoor bob it, that way your junk doesn't fall out.
by Gidian Wareshire Fairchild November 14, 2012
A Back-Door Bob is one who prefers to utilize the anal passage over any other orifice. The term is not gender specific.
Tony - 'He proper loves loves putting things up his arse, man'

Terry - 'Aye, he's a proper Back-Door Bob like'
by nickle69 June 11, 2013