What is tired as fuck?

When riding bicycles, striking the front tire of one bike repeatedly into the back tire of another bike, usually causing a large fart sound.

I tire fucked Nick so hard that he crashed into a lake.

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tired as fuck - video

Tired as fuck - what is it?

Not being able to think of anything but sleeping, but it is to early to go to bed

After that big hike today im am Tired as Fuck, but its only 6pm.

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