The passing of a female companion after An alpha male (DB) has his way with her excluding all emotional ties, to a friend in the circle that has interest.
The passback is a sex move. It involves one male and one female. This sequence of events, if properly executed, constitutes a passback:
1. The male ejaculates into the female's nose
2. The female snorts up the semen and "hocks" it
3. The semen is spat back into the male's mouth
4. The male spits it into the the female's vagina
5. The female must subsequently show evidence of proper execution—pregnancy or an STD, for example
Bro 1: Bro, I'm itching for a freaky slam piece.
Bro 2: I got just the cum dumpster in mind.
Bro 1: Really? Will she do the passback?
Bro 2: Yeah, bro, I already pulled that DW passback on her.
Bro 1: No shit? How was it?
Bro 2: Fan-fucking-tastic.
When similar looking people share the same photo ID or season pass to get into events by discreetly passing backwards the first person's ID to the second after the first already entered.
Called Mexican Passback because Mexicans are both cheap (wouldn't buy an extra pass) and they all look the same.
Ricardo: (enters concert with pass, performs a Mexican Passback to Roberto)
Roberto: (hands pass to guard)
Guard: Didn't you just enter 5 min ago Ricardo?
Roberto: Yes, Hello, I am Ricardo, I just had to step out for a moment
The small yet numerous particles of urine that are reflected back at you when you pee into a urinal/toilet bowl. This phenomena usually happens when too much force is exerted when trying to force the urine out, causing the pee to have such a high velocity that when it strikes the surface (either water or porcelian) it instantly atomizes and reflects back toward the direction where it originated from.