To ingest LSD
(or occasionally other hallucinogens
) given to you by another person, usually as a gift but sometimes in exchange for other drugs
Also, to "steal someone's face" is to give them LSD, which they generally consume on the spot.
see also "steal her face", "stole his face", "steal your face", "steal their faces", etc, etc.
"I shared my last blunt with Sally last night, and she stole my face in return"