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1.
A heavy woman with large breasts. Can have positive or negative connotations, depending on the speaker's tastes.
Wow, she's a total moo job.
door Allochthon 18 augustus 2006
 
2.
Getting a blowjob while someone is milking you. milking is when someone rubs your prostate gland in your butt.
Wow. A blowjob with some chicks finger up my ass, it doesn't get any better than that.
door Lord Baron Count Von Darkity Dark 13 januari 2003
 
3.
The name given to a blowjob when the giver or recipient has a nickname of 'moo moo' and/or is shaped like a cow. It is often accompanied by a mooing sound as the receiver ejaculates.

Some couples dress up as cows for added effect, note that this is not to be confused with 'milking the moo'. Uniforms are optional.
Angela gave Tom a hard moo job while on all fours.
door SJASM 23 september 2008