Exactamundo

[Tina]

Means yes, exactly, right, or thats correct. The word appears to be derived from the English word exactly.

[Donald Trump]

Exactly.
Conceivably derived from exactamente, Spanish for exactly.
It is used primarily by U.S. non-Spanish speakers. The Fonz, a hip irreverent character on the 50s TV show The Happy Days is responsible for some of the earliest recorded utterances though its likely to have been in use before then.
The second half of the world mundo, possibly results from mishearing exactamente and, in another context, mundo, world in Spanish. Interestingly the understood meaning has nothing to do with the meaning world. Even so in Spanish it might translate as exact world, though the gender of exacta renders the phrase grammatically correct.

[PussyCat]

Meaning exactly or precisely. It is a variation of exactly just with additional syllables for improved pronounciation.

[Jessica]

Literally means exactly around the world