While not a standard technical term in general music theory, in this specific niche it usually signifies one of the following:

The phrase in the context of the YouTube video "Tzanca - Program ascultari si jocuri tiganesti Banat Live 2021 NOI" refers to a specific music style or production technique commonly applied to modern Manele (a genre of Romanian pop-folk).

: In some instances, "deep" refers to an effect where the artist's vocals are pitched down or layered with a lower octave to create a more soulful or heavy "deep voice" sound.

: It can describe a track with more "depth" in its mixing, using specific reverb and spatial effects to make the sound feel more immersive and "expansive". Context of the Video

You can listen to the specific session on the YouTube video "Program ascultari si jocuri tiganesti Banat Live 2021 NOI" .