"suh" is short for "What's up?" and is used by really really really really stoned stoners that are too lazy and stoned to use whole sentences.
Dude 1: Suh dude?
Dude 2: Not much mang, just hidin' my kids and wives cause theire rapin' errbody out here.
To relax with your laptop in your lap.
Aww man, yesterdays swingers-goth-orgy was exhausting so i'm just going to laplax all day.