The the mentally handicapped, and thus often euphoric or hysterical state of mind that follows a night of heavy drinking.
"Sally was definitely on half-speed this morning after Edward 40-hands last night. At Breakfast she almost peed herself laughing when someone pointed out that her shirt was buttoned up incorrectly".
by Jogana Jallenstrom October 29, 2009
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people who are half speed are ether stoned or ur thinkin sumting dat is wrong
by Chris martinez AkA CujO September 29, 2006
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