What is momenti?

Bastardization of the word moment.
Used in the context of something the speaker would like to do, as opposed to moment which often implies effort.

"This is really sweet.. fun activity"
"Cool I'll check it out in a momenty :)"

"I need this report done damnit!"
"Okay I'll do it in a moment.. :("

momenti - meme gif

Momenti means to Relax, take it easy, not to worry.

From the anime Digimon; season 3. Terriermon says Momenti when there is a problem.