Pushing the Manifold

When you go just a centimeter before "the line." You aren't Crossing the Line, you're simply getting as close as possible.

South Park was Pushing the Manifold by including exactly 399 swear words in South Park: Bigger, Longer, and Uncut, as having 400 would put them at an NC-17.

Push And Sniff

The derogatory to describe the sport of Rugby in Australia as Rubgy is pushing the ball and then perceiving to sniff the player's arse to get the ball back.

Could also be described as a sexual position

Tom: Ha ha ha you like GAYFL!
Jay: At Least I don't sniff my mate's asshole playing push and sniff!
Tom: "Crying intensifies"

Push Cart Derby

A statement meaning, not as easy as it looks or more difficult than you think.

Victor: You cant pick up that rock, pussy.

Josh: Yes i can, fah-got, fassyman fi dead brejin.

Victor: Wha' yah think this some kinda push cart derby, pussy?

Push the Bush

To buy a drink of Bushmills Irish Whiskey for your friend. White Bush, Red Bush, Black Bush It doesn't matter the color of your favorite Bush, all Bushes are good.

Push a bush before you push the bush.