Stoner's Lap
1. When the smoker has been sitting while smoking and has accidentaly tipped ash upon their jeans. It is most prominent among cannabis smokers, hence the phrase "Stoner's Lap".

2. When one has been rolling or preparing cannabis smoking joints/devices and has spilled cannabis and tobbaco on their lap and have not brushed it off. Can also apply to cooking.
Smoker 1: Hey man what's up?

Smoker 2: Not much dude, just smoking a J and it's giving me hardcore stoner's lap.

Smoker 1: Aw man brush that crap off.

Smoker 2: No man, black jeans, it'll make it worse.

Smoker 1: Damn dude. I'm too stoned.