tinder bombingのようなどんな単語でも探してください。
 
1.
Exaiming anothers body, especially chest, crouch and butt regions. Usually people do this to stranger but occsionly to people they know. Usually done somewhat discreetly
The guy at the park was checking out the hot girl as she walked by
Santas Sexy Helperによって 2004年07月28日(水)
 
2.
to commit suicide; to end your own life,

stems from checking out of a hotel, checking out of your own life, choosing to leave.
i fucking gone im gone im gone, so im checking out. im checking out real soon.
john goldによって 2007年03月15日(木)
 
3.
a term used on instant messaging services. meant as "im gunna go"
urscreenamesuks: yo, im gunna check out, i'll catch ya lata
morganによって 2005年04月16日(土)