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1.
Basically, on a night out, where one will go home very early in order to get laid. Also known as a complete let down.
Jeff:Where did bob go?!?! it's like 12 o'clock!!
Seb: He did a robyn.

Ex 2.

George: Where the fuck is he going?
Richard: He's Doing A Robyn
by AllOfJavea March 07, 2011