"Pleite" is slang and is only used informally. It can be used in two ways:

1. gone, out of here [adjective] ['plei-tu']

Here it is also often used in the phrase "pleite gaan", which translates to "to clear/take off".

Examples:
- "Jongen, ik ben pleite."
("Dude/Mate, I’m out of here.")

- "Weet jij waar Eline is?" – "Nee, ze was ineens pleite."
("Do you know where Eline is?" – "No, all of a sudden she was gone.")

- "Kunnen we nu pleite gaan?" – "Nog heel even Yolanda, het is zo gepiept."
("Can we clear off now?" – "Just a moment Yolanda, it won’t take long.")

 Related words:
- "Peren": to leave.
- "Pleiten": "Pleite" is not to be confused with the verb "pleiten", which translates to "to plead". The following example contains both

- "Na het pleiten in de rechtszaal ging de advocaat pleite."
("After pleading in court, the lawyer cleared off.")

Extra: more on the background of "pleite" and "pleiten" can be found in this article (in Dutch).

2. nowhere to be found, gone, missing [adjective] ['plei-tu']

Examples:
- "M’n sleutels zijn pleite. Wat nu?"
("My keys are gone. Now what?")

- "Sinds de verhuizing is de afstandsbediening van de TV pleite."
("Since the move, the remote control of the TV is missing.")

Related words:
- "Weg": gone, left missing away.
- "Kwijt": gone, missing.
- "Foetsie": [informal] gone, missing.
- "Verschwunden": [informal] past particple of the German verb "verschwinden": to disappear, and for some reason informally used when something is nowhere to be found and you have absolutely no clue.