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A state of intoxication in which a person may (hopefully) be after consuming a number of drugs including but not limited to Ice, MDMA, Dexies, Pingers, and most commonly Speed. All of these drugs are types of Amphetamines, hence the name. Similar to saying that a marijuana-smoker is "stoned", or that an alcohol consumer is "drunk".
Uni Student #1: You seem unusually happy today, are you drunk?
Uni Student #2: Nah, I'm just Amphing off my head!

Kate: Can we get Amphing tonight?
Me: Hell fucking yes we can!
by Jacqui.Alswick June 24, 2011
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