blowback, n. — Green’s Dictionary of Slang

blowback n.

1. (US prison) making restitution, returning stolen goods.

1960		(con. 1950-1960) R.A. Freeman Dict. Inmate Sl. (Walla Walla, WA) 13: Blowback – the act of returning stolen goods; to make restitution, etc.
2018		‘Aidan Truhen’ Price You Pay 218: Oh Karenina. I knew in some form there would be blowback. I knew if you got really pissed off you would overstep.

2. (drugs) an exhalation of marijuana/hashish smoke into another’s mouth.

2000		‘Tarquin Mandrake’ ‘Fuck it, have a bucket’ posting 17 Jun. on ‘StonerTimes’ at Yahoo! Groups 🌐 blowbacks, where one person risks a lisp by sticking the joint into there mouth with the red hot end facing there tonsils and blows smog into another stoners lungs.
2003		‘JBoom’ ‘Afro Dumpty’s Dictionary’ at JBoom.com 🌐 Blowback – the inhalation of anothers exhaled chuffin stuff. Blowbackmat – take a few tokes just b4 u give a blowback and blow da smoke out the side of ur mouth when givin the bloback.
2005		B. Hare Urban Grimshaw 45: ‘Want a blow-back, Pixie?’ She nodded, whereupon he turned the joint round and put the lit end into his mouth. He brought his lips up to hers and blew a steady stream of smoke out of the roach end [...] into her mouth.
2012		J. Fagan Panopticon (2013) 235: ‘D’ye want a blow-back?’ [...] Shortie leans in and blows the hot smoke into my throat and it burns like fuck.

3. the spray of blood, bones, tissue etc from the victim that follows a shooting.

2001

G. Pelecanos Right As Rain 132: Earl slipped the .38 back into his jacket. He checked his clothing for blowback and saw that he was clean.

4. punishment.

2010

Codella and Bennett Alphaville (2011) 306: Blue Eyes gave the Navarro brothers [...] the no-blowback green-light to kill Felix.

5. (US) complaints, inquiries.

2019		D. Winslow Border [ebook] He’s already getting blowback about Cirello. [...] [H]is lieutenant came in to talk to him, shut the door behind him. ‘Organized Crime is hearing shit about one of our guys’.
2021		C. Hammer Opal Country 14: Blowback. The revenge of the od guard.

In phrases

rising blowback (n.)

(US drugs) exhaling cannabis smoke into someone else’s mouth, then moving from a crouching position and slowly standing up for an increased sensation.

2000

‘Tarquin Mandrake’ ‘Fuck it, have a bucket’ posting 17 Jun. on ‘StonerTimes’ at Yahoo! Groups 🌐 Which leads on naturally to the rising blowback, which starts off with you both crouching and then standing together as the smoke hits you.