(see, immense, quality, beast)
derived. scottish slang

adj. When something is of high standard, very good or just generally frikin' immense.
Here ya dobber check that fokin quality ride man! That has heafty nice rims like!
by SiliconSlick January 21, 2006
This is one of those shits that takes a bit of work to get out, but when it hits the water it sounds like you've dropped a bag of groceries & usaually spashes your arse.
"man, my arse is so wet after that
"Heafty brown bag".
by 007 in heaven September 11, 2008