bumcaustic 

to absorb the warmth from a seat generated by another person's bum.

as i sat down on the toilet i experienced bumcaustic created by the previous occupant.
(bumcaustic is primarily experienced on public transport)

bumcaustic by david lazarus January 9, 2006

Bumtastic

His bum was fantastic.

His bum was fantastic. Wait...bumtastic!!

Bumtastic by HerbieFullyLoaded December 17, 2013

bumbastic 

means really really good. like the bomb and fantastic.

"That guy is bumbastic."
"This ganja is bumbastic."

bumbastic by Erin November 7, 2004

bumbastickah 

west-indies word for a dude who glues himself onto girls behind.

get off mi bumsee, yuh bumbastickah!!!

bumbastickah by not-a-clue April 29, 2008

Bumtastic

The act of someone asking for a dollar during lunch, even though he has money.

Kola: Yo man, hit me up wid dat dollar.

Drew: Kola, you're so BUMTASTIC! GO HOME!

Bumtastic by Mark Jenkins June 25, 2010

bumtastic

just SO good

check out meh new jumpah?
oh what thats bumtastic yo

bumtastic by roobi October 1, 2003

Bumbastic 

To be excited to have something put in your bum

Tom: Dangils I got the 22in black hammer
Dangils:Oh baby I’m so bumbastic

Bumbastic by Dangilz April 27, 2019