Make Stuff Up

to make stuff up

An activity of the mind anyone can indulge in.
It is the act of simply constructing an entertaining story or otherwise for the amusement of yourself and/or your peers.
It is essentially an elongated White Lie in story mode.

For increased effectiveness the teller is required to have excessive creativity and/or a good imagination

Making stuff up usually serves to occupy the brain of the subject when he/she has nothing better to do with their time and has grown tired of using their creative side and/or imaginative ability to construct a realm where having everlasting hot sex with Eva Longoria, kinky pornstar sex with Priya Rai or even a mixture of both with some other super gorgeous lady, is a possibility, since those things can only happen outside the realm of reality.
Try it.

A: Hey man, how was your weekend?

B: Me n the boyz went out Saturday night to some party, tits n booze everywhere!
Think I took some Methylenedioxymethamphetamine, next thing I knew I woke up outside next to a naked Lara Croft

A: Man, I know when you make stuff up,
so let me rephrase my question:
How was your weekend, REALLY?

B: Damn, well...

You can't make this stuff up

An expression said in response to an an unbelievable fact or piece of news.

Did you hear about that burglar who called 911 after breaking through a store window because he was afraid he'd cut himself on the way out? You can't make this stuff up.

You Can’t Make This Stuff Up

A response used when someone has just told a story that’s so ridiculous, random, and unbelievable that you couldn’t have made that up as a story if you tried-it’s beyond the bounds of human creativity.

Dudebro 1: Dude, you’ll never believe what I just saw today. A guy dressed as Ronald McDonald was getting arrested outside of a Burger King for indecent exposure.

Dudebro 2: No way bro.

Dudebro 1: I swear!! You can’t make this stuff up!