unable to use either hand well
(Jordan and Jason see a homeless man on the street)
Jason: Dude, I gotta go rub one out.
Jordan: Need some help? I *know* you're unbidextrous.
unable to do anything with either hand.
Dad: Hey Son, I need you to help me work on the roof today.
Son: Nah, you know I can't help you, Dad, remember I unbidextrous.