The general feeling of despair and/or lack of motor coordination associated with the morning after a person has used ecstasy (MDMA). An ecstasy 'hangover', if you will.
"Fuck, you look skaggy. How many yokes did you take last night?"
"Man, those buzzers last night were shite. I'm so on the skag this morning.
"I'm so skaggy right now it's ridiculous. Seriously, just kill me. Savage buzz last night, though."
Adjective: Skaggy describes a person, usually a female, who somehow manages to be skinny and flabby, or saggy, at the same time. Usually accompanied by cellulite and a pair of daisy dukes.
Can also be used as a verb: A person might be skagging if they are eating ho-hos while watching soap operas, or holding a baby while smoking a cigarette.
A girl who instead of using a bra to push UP her boobs, she uses it to push them together, to try and give the effect of cleavage. She also has a wide, flat ass.