Green’s Dictionary of Slang

(orig. US campus) to wind down and relax.

2000		Pantagraph (Bloomington, IL) 8 July B8/2: Chillax: This is the word to use if your friend’s spazzing and you want to get them to chill out and relax. So it’s like: ‘Chillax, buddy’.
2004		Eble Campus Sl. Apr. 1: chill + relax: I ended up chillaxing at Mike’s place last night.
2004		P. Howard PS, I Scored the Bridesmaids 163: Chillax, Ross, I was only asking.
2010		Mail & Guardian (Johannesburg) 9 Jan. 🌐 Chillax is universal kid slang, not originally SA.
2012		C. Eble (ed.) UNC-CH Campus Sl. 2011.
2016		Times (Sat. Review) 20 Aug. 🌐 Do monsters chillax? An extraordinary album of photos, which emerged in 2007, depicts downtime for the SS officers from Auschwitz.
2019		www.verywellfamily.com/a-teen-slang-dictionary 10 Mar. 🌐 Chillaxin - Chillin' and relaxing.
2021		P Howard Braywatch 261: ‘Chillax, Raisa’.
2021		Twitter 2 Dec. 🌐 General chillaxing waiting to go to groomers.