A boy who is a skinny shitling but believes he is hench. A bubai therefore lifts too much at the gym and ends up with musculoskeletal injury
"Dude why are you limping?"
"I'm such a freakin bubai and didn't realise it so I hurt myself at the gym man"
by Diggy123 January 17, 2014
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When you see a baby with a lot of bum you would call it a bubay. The bubay is known for having a very sloppy, poo-filled bum at all times. Try to avoid a bubay if you want to keep your nose (it may fall off from the stench).
Person 1: what is that magnificent creature over there?
Person 2: oh that stinky thingy, thats a bubay.
Person 1: oh no. Time to run

*both run away as fast as humanly possible*
by Cuttlefish man July 18, 2019
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"Bubai" is an expression. People are called "bubai" if they want to avoid an uncomfortable conversation by using misleading information about something that's not related to the current subject at all.
1."Don't be a bubai all the time. I know you're trying to change the subject".

2. -Where were you last night?
-You look so pretty! Is that a new dress?
-Well thank you! Oh no, you didn't! Stop being bubai, that ain't gonna work.
by Dumdum#1 February 23, 2018
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