godan verb (-ru)
take a picture with a Cheki camera
Slang verb derived from the Fujifilm instax 'Cheki' brand. Used for taking instant photos with a Cheki camera, often in casual or social media contexts.
See also: チェキ
友達とチェキって、写真をすぐにシェアした。
I took a Cheki photo with my friend and shared it right away.
チェキ is the noun for the camera or the photo itself; チェキる is the verb meaning to take such a photo.
From the brand name 'Cheki' (Fujifilm instax) + verb-forming suffix る. The exact derivation is straightforward; the term emerged as casual slang among users of the camera.