tweak the bean

1) When a girl masturbates by exposing her clitoris with two fingers, and rubbing it with a third finger.

2) Clitoral stimulation

"Dancing with those guys really got me worked-up! I am going home to tweak the bean!"

or:

"Dude, it's so easy to give her an earthshaking nut! Just be sure to tweak the bean, and she'll cum all over the place!"

Tweaking On The Bean

The particular frenzy or stimulation you feel after drinking too much coffee. Can also be used as an euphemism for clitoral masturbation.

"He had 5 coffees today, bro is tweaking on the bean."
"I got home, into bed, got my vibrator out, and spent all night tweaking on the bean."

Tweaking of a soy bean

A person that is tripping of a soy bean

That bitch tweaking of a soy bean right now