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1. A man who was once a hard donny...drinker, rager and all around badass who - due to engaging in an exclusive monogamous relationship- has now become like melted soft serve ice cream relinquishing all of his past friendships and overall beast mentality for a life of Netflix and missionary sexual intercourse.

2. Flaccid penis
Soft donny spends his Friday nights watching Gilmore Girls with his Girl friend.

Last night my boyfriend had a soft donny.

by beepbopboopbeep January 10, 2015
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