Green’s Dictionary of Slang

1. a promiscuous man or woman.

1967–8		Baker et al. CUSS.
1989		P. Munro Sl. U. 111: Bill has slept with three girls this week. What a hoser!
1990		Eble Campus Sl. Apr. 5: hoser – promiscuous female.

2. a fool, an idiot, an uncultured, boorish person; note mis-defined as a n. in cit. 2001.

1981		Toronto Star 2 Nov. A4/5: For parents puzzled by talk of hosers and such, Rick Moranis explained in a telephone interview from Edmonton, where the show is taped, that ‘a hoser is what you call your brother when your folks won’t let you swear.’.
1999		Guardian Editor 27 Aug. 16: A hoser [Can. an offensive term for a person who is considered to be unintelligent and vulgar, especially a man whose main interests are ice hockey and drinking beer].
2001		OnLine Dict. of Playground Sl. 🌐 hoser adj. A moron or loser.