Depends on the context. Either that you have to walk slowly, for example when you're walking on a slippery road. 😅 Or that you have to leave soon. It's most likely the second one though.
"Ich muss langsam gehen/laufen, damit ich nicht falle. Der Boden ist rutschig." ('I have to walk slowly so I don't fall. The ground is slippery.') (I'd actually say "laufen" here rather than "gehen". "Gehen" usually means to go somewhere, whereas "laufen" just means to walk.)
"Willst du noch was bestellen?" ('Do you wanna order anything else?') - "Nein, ich muss langsam gehen." ('No, I gotta go (soon).')
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