To take advantage of a woman that normally finds you extremely unattractive, usually done when the girl is either emotionally distressed or extremelyintoxicated
Bro 1: Where did audrey go? She passed outon the coucha few minutes ago
Bro 2: I think william took her upstairs....
Bro 1: There he goes again, always pulling a robbie
On December 14th, you go to a person who has been given the nickname "Robbie" and try to win him over for the day. It becomes bonus points if he is in a current relationship
to mask one's shaky live performance and/or unfamiliarity with the words of one's own songs by enlisting the crowd to sing instead, often for entire verses and choruses, in the manner perfected by Robbie Williams
Bono didn't seem himself when U2 played Glastonbury: he kept doing a Robbie and gettingthe crowd to help him out by singing on his behalf.