Top Definition
To comparing the size of one's penis to a toothpick.

Antonym: donal

Related Words: don deutsc, done-bag, donee, dondling, donation, donard, donaldo, donaldology
1) I thought my penis was super small until I decided to do a little donsizing.

2) "Oh my GOD! It was so small," she said. " I couldn't even donsize it!"

3) Donsizing was just the first step in the downward spiral towards becoming a gum guzzling nickel whore.
by Argos TheDog February 03, 2012

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