n2t, sometimes ntt, simply means "Need 2 Talk", or "Need To Talk". This is usually used as a quick way to get someones attention, being frequently used to get someone to unblock you for an important cause.

A cultural and aesthetic mind-state that prioritizes making money, even as an “underground” or “radical” creator. The work isn’t made for money, but it’s the money that matters the most.

"Need To Talk" in chatspeak