Sexual act involving a male partner urinating on a second (or multiple) partner(s) to remove sperm previously ejaculated on his/her's face. It is usually performed with one partner standing, or otherwise elevated such that his reproductive organs are adjacent to the "recipient's" face. The second partner(s) may sometimes kneel or adopt a crouched position to facilitate this. The sperm must not necessarily be completely removed, as it may sometimes contribute to the final result by mingling with urine.
The name refers to the organic "change of gears" which takes place when the first partner must switch from ejaculation to urination.
I stood by that kneeling woman and sprinkled her with my sperm, then performed a "Change of Gear" and urinated all over her head and neck.