chronically late 

Any time you smoke weed after 4:20pm. The history as to why it is PM and not AM as well is unknown, but likely arbitrary.

Alt: Slang for when a dealer takes a longer than usual amount of time to deliver your pot.

"Man, it's five o'clock and you're just now smoking up..? You're chronically late!"

or

"Usually on time, Timmy wondered why PK was chronically late with the kind he had ordered."

chronically late by Sleightflow October 22, 2012