I always thought a one-hitter had to with baseball. Like Nolan Ryan pitched 12 one-hitters as did Bob Feller. They share the record.
But a client of mine who was stopped for running a stop sign and then whose car was searched because of the acute olfactory senses of a police officer who smelled the odor of burnt cannabis emitting from the car’s interior, referred to the pipe found by the police officer as a “one-hitter.”
Apparently, it’s only big enough for one hit at a time. Of course in this case like in baseball a no-hitter would have been better.
But I guess for the smoker it might be better to have a 12-hitter or some variation thereof.