The act of drinking chocolate milk while having an orgasm.
I've tried the milky finish yesterday, it was awesome!
As you're cumming at the end of sex, you down a whole jug of chocolate milk. Similar to the term blumpkin.
"I bought some chocolate milk today so me and my girlfriend can try a milky finish."
Just fucking down an entire jug of chocolate milk while cumming inside of your partner. Similar to a blumpkin but not as gross.
Sean: My milky-finish was ruined last night after I bought a jug of fat free chocolate milk.
Tobey (Maguire): Pizza Time