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refering to a female being ripe, moist or both
ahh shes looking roist, aran your mums roist, ohh its roisting in here!
Roist by Theeman2k10 :) April 28, 2010
watchaa do last night mate??

Fuck all, roisted a wee slag!!
Roist by scottmcdee July 26, 2009

Roast File 

An electronic file folder or other compiling containing unflattering videos, photos, Snapchats, texts, etc. of a friend for future roast, embarrassment, or blackmail.
*Takes picture of friend sleeping with mouth wide open* "I'll add this to my roast file." *Cackles*

Los Santos Institute of Roastology 

A high-end university run by Lamar Davis which teaches its students the science of roasting, especially yee-yee ass haircuts. It is located in Los Santos, San Andreas, USA.
Person 1 : Can i come to your house?
Person 2 : No, we will meet tomorrow at work
Person 1 : Ah man, don't hate me because I'm beautiful man, maybe if you got rid of that old yee-yee ass haircut you got

you would get some women craving for your penis. Or better yet, maybe Tanisha will call your desperate arse if

she stops enjoying coitus with that brain surgeon or lawyer she is making love with. NIGGAAAAA
Person 1 : what?

Person 1 : Do you go an university or do you work?
Person 2 : I go to the Los Santos Institute of Roastology
Perfect in every way possible, she will always be there for you. She’s caring, funny, considerate, and drop dead gorgeous. If you ever get the chance to date one, don't ever let her go. Ristins tend to get hurt but are very forgiving and understanding. Love them as much as possible
I never should have let Ristin get away.
Ristin by stiles777 May 20, 2020

roastosis 

noun - the study of the proper technique to advance one's roasting and dissing skills, typically studied before a twitter fight or a rap battle
Johnny won the rap battle because he studies roastosis.
roastosis by RoasterExpert9000 December 16, 2014