Top Definition
Mythical recreation drug. Though an actual research chemical, it's more than unlikely that it's on the streets.

Rumors of MK-801 use/abuse, a dis. anaethetic more powerful than PCP have been floating around for a while now. When I looked into MK-801, it was over $150 for 10mg, not nearly enough for any kind of high... and the precise dosages are undetermined.

If there was any recreational MK-801 use, it would be ALL OVER the dextromethorphan underground.

Still, someones best friends cousin's sister's worst enemy tried it, and ended up tripping balls for three weeks!
Yeah, Johnny MK'd out last week, he's at the state hospital now.
by zoey April 11, 2004
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