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At term used to describe DXM (Dextromethorphan), a drug found in cough syrup similar to codeine, that is sold over the counter (OTC) at pharmacies. High dosages of DXM produce similar effects to PCP (Phencyclidine). Therefore, DXM is over the counter PCP: OTC PCP.
John: Yo dude you pick up that Robitussin yet?

James: Hell yeah dude. We gonna be trippin on OTC PCP tonight!
by powdehr October 14, 2015
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