It's a way to playfully insult someone by saying their stomach sticks out more than their penis (weenie) does.
Guy#1 Man you got a "weenie do"!!!
Guy #2 What's that?
Guy #1 Dog, your stomach stick out more than your "weenie do"
Guy #2 What's that?
Guy #1 Dog, your stomach stick out more than your "weenie do"
by Boo & Brasen March 15, 2009
Examples of past folks with Weeny-Dos are, and not limited to, Rick Ross; John Candy; Big Pun; Notorious BIG; etc...
by LafNowCryMañana March 04, 2012