Using the amphetamine as a dietary substance by abstaining from food for the duration of the dosage. IE, 8 ball = 20 hours, a half = 100 hours and some felonys.
I was on my meth diet when I shot them crackers to gets money for more medicine.
Guy: Bro, I took diet meth the other day and spent 12 hours sorting the spices in my kitchen
Adderall or other ADHD medications that are basically just methamphetamines (but let's pretend it's not close to the real thing)
"I know my son doesn't actually have adhd I just had his doctor prescribe him diet meth so I could clean the house lol