Push pop

[Little_Girl]

The reverse of a rusty trombone, it is when the female (or male) stimulates their male partners anus with their fingers (preferrably a big thumbs up) while simultaneously performing oral sex.

[Justin Bieber]

When a girl sticks her finger/hand/fist up your ass while she is sucking your dick. Primarily to make the cum shoot out.

[Sonia]

Sticking ones hand/fist up partners anus.