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1.
Someone who dunks the proverbial donut into the company coffee; i.e., someone who sleeps around with colleagues from work.
"Check out Alan, he's hitting on the new chick already"
"What a donut dunker!"
by WingNut November 16, 2007
 
2.
A man who likes putting his penis into another mans anus.
Lisa likes Gary but she doesn't know he's gay! Yeah, I heard he was a donut dunker.
by dollmusic October 12, 2011