Exposing someone or something to the vacuum of space, usually by ejdcting them from an airlock on a ship or station.
Spacing the saboteur wasn't easy, but it had to be done.
Spacing the unidentified device seemed wasteful, but it was too dangerous to keep it onboard.
The feeling of change in perception after taking a mind altering drugs,
for example: hallucinogenic or disassociative compounds.
Dude1: BRO I'm spacing on this dank kush.
Dude2: SAME ni🅱🅱a