A very large quantity in an unusual number or configuration (otherwise it would be an ordinary/English buttload). Compare: metric shitload and metric fuckton, which both designate a very large, but expected, quantity.

A celebrity free pass is an agreement between you and your significant other that if you meet said celebrity and there is an opportunity to sleep with them, your partner cannot get mad at you for doing so because you had agreed before hand that this person was your celebrity free pass. It is ideal if both of you in the relationship choose a celebrity free pass so that the playing field is even.

The metric equivalent of a shit ton.

Seventeen. Why? Count for yourself the next time you have a metric buttload of anything; you'll see.

A most swag unit of measurement used by gangstas and pimps of a classier variety. Unlike its uncultured counterpart metric buttloads shitloads and fucktons are all base ten and as such far easyer to use in calculations.