Gimmie Dat (later renamed Gimme Dat) is a catchphrase of Nova's as well as a highlights type series on his channel.
"Gimmie Dat" originated as a catchphrase or running gag for Nova, something of a counterpart to Kootra's "I'll take it". The phrase has appeared in many series, and is used when Nova takes an item, acquires points, or for no reason at all.
The series is similar to Channel Classics in that it it shows the best or funniest clips from a gameplay series but Gimmie Dat has highlights from more recent videos, rather than "classics". Also unlike Channel Classics, Nova chooses the clips for Gimmie Dat himself.
The series doesn't have any particular structure but often shows a snippet of gameplay or a small selection of similar clips, up to a few minutes long, then a slow-motion replay of the best part.