The sexual act of masturbation with a hot dog bun, where you insert "the meat" (penis or labia) betwixt the bun. Provide your own sauce.
Ooooh, I've got some spare buns for later, so I can have a good 'ol Chubby Rupert, hold the mustard.
by Joanna Cuddle October 7, 2023

a kind, funny and a little bit annoying kid. he has lots of frands and his fav thing to do are to sing and to danse. he talks way to much. he has curly bloond hare.
by RainbowNM April 6, 2022

by KHA0S420 April 27, 2022

A player on Roblox that goes around spamming the n word on voice chat around people to get them banned.
by the.bitchin.rado August 15, 2025

A fuckin beast ass nigga u shouldn't fuck wit but he hella dope thou he a pimp ass nigga who hella chill fuck wit me
by Jwrizzle mynizzle June 5, 2018

Derived from an edited GIF of Klaus Schwab. Upon seeing the GIF a strapping young fellow said the following words, "Rupert Brain" And the rest is history...
"Rupert, Rupert, Rupert Brain, Rupert Brain, Rupert Brain, Rupert, Rupert, Rupert Brain, Ru' Rupert, Rupert Brain" *To the tune of 'In The Hall Of The Mountain King'
by Simon Slug Sumoner January 6, 2025
