Half-dusted

Intoxicated, inebriated, stoned, drunk, high,

And gathering serotonin you normally lack, making you giggle more than normal

Carrie was half-dusted and could not stop giggling at a dumb joke
What we know
If big trucks =small d*cks, then small cars = big d*cks
Big shoes = big d*cks

Clowns.