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1.
The act of taking LSD. as in ACID. as in lysergic acid diethylamide.

not dxm. cough syrup is fuckin stupid.
I was dosing, now I'm seeing time and melting into the sidewalk
by poophead444 June 18, 2011
 
2.
The act of ingesting DXM.
We ran out of illegal drugs so we decided dosing would be a good way to get high.
by Fred Riahi March 05, 2006