noun or participle which takes 'suru'
locking yourself out; shutting yourself out with the key inside
Wasei-eigo from English 'in key'. Refers to the situation of accidentally leaving a key inside a car, room, etc. and being unable to get back in. Used as a suru-verb.
wasei-eigo (Japanese-coined English), from in key
車を降りたときにインキーしてしまった。
I locked myself out of the car when I got out.
インキーしないように、鍵は必ず
To avoid locking myself out, I always keep the key in my pocket.