Men (typicallly of Punjabi descent) with extremely foul smelling backs, particularly on hot days.

The term suggests that the individual excretes feces through the pores on their backs, which mixes with sweat and saturates their clothing.
Brendan: Fahad was giving me a piggyback ride and some smell made me vomit on to the back of his head.

Tom: What a fucking crapback.
by IDunGoofed July 18, 2012

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