Mincing is an act carried out usually in the lesbian communtity, it consists of thrusting your right fist down and spinning clockwise, then thrusting the left fist down and spinning anti-clockwise. Whilst doing this you must grind your hips to the rhythm of your hands.
"I'm going to mince her right up."
"I'm mincing to get home."
"Yeah, I minced some girl last night."