Auf Lock is a German slang phrase that literally translates to "on lock." However, in the context of this song and modern German youth slang, it means to be chill, relaxed, or to do something with ease and confidence.
Money Boy uses it repeatedly to emphasize a laid-back, confident, and carefree attitude, whether he's smoking weed, popping bottles, or just generally living his life. It's a very current and cool expression in German street language.
This is a boastful party track from Money Boy built around the German slang phrase "auf Lock," which roughly means having everything under control or chilled out with your crew. He raps about partying, smoking, showing off his car, and joking about viral internet culture (including a nod to streamer IShowSpeed).
It's a lighthearted brag song more about the vibe of the night than any real story, with the chorus circling back to relaxing with friends while the verses stack up playful, over-the-top boasts.
Note: the lyrics include explicit sexual and drug references.