To fall asleep so hard that you bury your face between two pillows. This often leads to some snoring and making the sound of a motorboat. This could also mean that you are so tired that the desire to sleep is just as large of a drive as your sex drive. You would rather do both motorboat and sleep, so you choose to motorboat some pillows.
Man I can't keep my eyes open! I am staring at the bed trying not to motorboat pillows.
by Vegasguy73 November 16, 2017
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When you're performing cunnilingus on a woman and you blow into pussy lips like a trumpet, causing the lips to flap
Your mother's pussy lips are stretched after all the Australian Motorboats she's gotten
by Ceweal Ceweal with Gwavy February 13, 2018
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1. Motorboating but down under and bit to the rear.

2. The act of someone oscillating their face back and forth while pressed against your gooch, while making 'brrrrrrr' sounds.

3. Motorboating for your gooch.
Guy 1: Gee this Coronavirus is really allowing me to find out more about what I like in bed
Guy 2: Oh yeah me too, the wife gave me an Australian Motorboat last night it was nuts
by dinkysweets104 February 08, 2021
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When you put your face between her cheeks and motorboat her butthole while shaking your head violently.
I Australian Motorboated her butt until she squealed.
by lordcoppinkaz March 02, 2015
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