Dumb cheated on his wife with a prostitute in Nevada.

I had been told Millie wasn’t that bright. But I didn’t have my first dumb-in with her until last week when she tried to open a checking account without proper funds.

That deaf "dumb" and blind kid sure plays a mean pinball --The Who

I cant believe you would test to see if that wire is live with your tounge. Man your "Dumb".

Kyle is a dumb dumb

Person 1: Your really extremely dumb
Person 2: Hunny, I was born dumb

Im so dumb i had to look up dumb on urban dictionary to find out what it means.
Retards

Me: How long would it take to get from Co-op City to Fordham Road on the 12?
Young Minority NYers: Dumb long, yo.