Dissociative drug (dextromorphan hydrobromide) found in cough medicine that can produce intense hallucinations and out of body experiences with high doses. Found in Robitussen Maximum Stength and Contac Cough Caps (pure DXM; no additives. Not available in the US, but found in Canada)
'You wanna trip on DXM?'
Its hard to give an example as it is a street term for a drug, not slang for an action per say.