Best definition
Weed + Insomnia
When giving up smoking Weed results in not going to bed any time before the sun comes up,

Then being overly tired the next day.

Harry: Fancy a toke dude?

Ron: No ive given up smoking that shizzle

Harry: I thought you look tired

Ron: Yeah i didn’t get to bed until 5:30am

Harry: You have a serious case of Weedsmonia dude