When someone is too lethargic to reply with the proper use of english, and so instead replies with the word "weish", as it can mean anything and everything.
Boy: Dude that party was so bangin' last night!
Lethargic Dude: Weish
Boy: I saw you go off with stacey man, how was she?
Lethargic Dude: Weish
Boy: Oh Sweet!
