When a person masturbates with their non-dominant hand
Man 1: Eww! don't touch me! I don't know where that hand has been!
Man 2: Don't worry, I'm ambidickstrous.
The ability for a man to masturbate with either his left hand or his right hand
Girl: So, do you beat your dick with your left hand or your right hand, jw.
Guy: I'm ambidickstrous, I alternate.
Able to use both hands equally well when performing masturbation.
One who is ambidickstrous is able to Choke the chicken with the right hand while in the shower or spank the monkey with left the hand while on the computer, thus freeing your right hand to use the mouse. Plus it's like knowing two ladies.
The ability for a man to have his penis hang indiscriminately to the left or right.
"Which way does it hang?"
"Either way, I'm ambidickstrous"
The ability to have sex, while performing other activities simultaneously.
Todd: Hey, did you hear? Tim was doing his homework, while banging Samantha.
Tom: Wow bro, Tim must be ambidickstrous.
Dexterity of penis
He entered her with his ambidickstrous penis from a funny angle.
When you're capable of using your hands, penis, and tongue all simulaneously during sex. Term usually reserved for men, or women with strapons.
Enhanced ability of ambidextrous
You're combing a club, and some female approaches you and, referencing a threesome, asks, "Are you ambidickstrous? My girlfriend and I want to play."