Green’s Dictionary of Slang

(orig. US) an excl. of annoyance, disgust, disappointment, commiseration.

1968–70		Current Sl. III–IV (Cumulation Issue) 18: Bummer: Bad luck.
1985		Eble Campus Sl. Oct. 2: bummage – expression of disappointment, concern, or exasperation.
1991		D. Jenkins You Gotta Play Hurt 147: ‘[Y]ou and I both know the badge is not for you, it’s for some buddy of yours, and you’re not going to trick me again.’ Bummer, he said.
1997–2000		Da Bomb 🌐 5: Bummer: Exclamation of disappointment or sadness.
1997–2001		Online Sl. Dict. 🌐 bummage 1. used to denote general sorrow, despair, or disappointment. (‘This place doesn’t take credit cards? Oh, bummage.’).
2004		J. Ellroy ‘Hot-Prowl Rape-O’ in Destination: Morgue! (2004) 269: Bummer – the little twist was Deadsville.
2007		Skins ser.1 ep.1 [TV script] ‘Mummy’s particular about odours, and we simply mustn’t [smoke], or she’ll go wild.’ ‘Bummer’.