Ungewitter literally translates to "thunderstorm" or "storm". It's a vivid and somewhat dramatic word that evokes a sense of intensity and impending chaos.
In the context of the song, "Ostend Ungewitter" (East End Thunderstorm) is likely used metaphorically to describe the dangerous or turbulent atmosphere of the artist's neighborhood, Ostend. It suggests that the area is a force to be reckoned with, much like a powerful storm, hinting at the illicit activities and tough realities described in the lyrics.
"Seit Wann" ("Since When") is a boastful street-rap track by Amo49 and Kalim. The hook repeats the same challenge over and over: since when do you have enemies, since when do you carry a gun, as if the other side only just picked up what the two rappers have lived with since they were kids.
The verses lay out why they feel entitled to that status: their block outsells everyone else's, they've been dealing since before they can remember, and loyalty is a fixed rule rather than a virtue - selling out a brother for a woman, or informing in court, are treated as things that could never happen "since when."
A short side-story about a girlfriend and her jealousy sits inside the bragging, but the song's real subject is reputation: staying consistent, staying loyal, and staying ahead, no matter how long the other side has been trying to catch up.