Ni ni

[Donald Trump]

Slang for night night

[Justin Bieber]

Spanish slang term used for describing a generation of youth (between 16-35 years old) that neither studies nor works.
No ocupation at all, they usually leech their Parents resources.
This word is originated from the conjunctions used in this sentence: NI estudian NI trabajan.
Plural form is ninis, can be written as ni-ni or nini.

[Little_Girl]

Baseball term for CADAY