Deverbal from guppa (“bob”).

gupp n

1. a small bump or hole/depression (in a road or the ground or the like)

• bula
• grop

• fartgupp
• guppig

• “gupp”, in Svensk ordbok [Dictionary of Swedish] (in Swedish)
• “gupp”, in Svenska Akademiens ordlista [Wordlist of the Swedish Academy] (in Swedish)
• “gupp”, in Svenska Akademiens ordbok [Dictionary of the Swedish Academy] (in Swedish)