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1.
A person who is the "giver" during anal sex... In other words the pitcher, not the catcher.
Look at that donut pusher wearing skinny jeans.
by Black Spartan June 03, 2009
 
2.
A man that puts his penis into another mans bum hole.
Son: daddy daddy why is that man putting his penis into the other mans bum?

Dad: cause hes a donut pusher son

Son: Daddy daddy can I be a donut pusher when I grow up?

Dad: no son hum Balls are much better

by Sir Nathan White February 19, 2009
 
3.
It is the same thing as a fudgepacker just differnet.
Jim: Hey Rick look at that Donutpusher over there.
Rick: Ahaha ya he is a Donutpusher.
by Andrew Bull April 06, 2005