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1.
A derisive term for a political progressive. First appeared in the 1960s as a term for old guard leftists of Jewish background. Derived from the tendency of Jews of Eastern European heritage to pronounce 'R' as 'W', in keeping with Yiddish pronunciation. Now can be used as a term for all progressives, regardless of ethnicity.
Boulder politics lurched toward orthodox leftism with the arrival of lots of pwogs in the 1980s.
by whatwouldantonchigurhdo March 19, 2010
 
2.
A large man having hard sex with a small woman is "pwogging."

It can also be used to describe the sound that a large amount of sperm launching from the penis quickly makes.
Hey Joe, did you know Mary got pwogged last night? FOR 13 HOURS????

or:

guy:"oh yeah oh yeah oh yeah, OH YEAH HERE IT COOOOOOMES!!!!!"
PWOG!
girl:oh yeah, its all over my face! pwog in my mouth!"
by the pwogger July 11, 2008