Meaning of belly-bumper in English:

belly-bumper

Pronunciation /ˈbɛlɪbʌmpə/

noun

informal, dialect US
  • (chiefly north-eastern). A ride on a sledge in which one lies on one's front and travels head-first; a downhill slide on one's front. Also attributive and as adverb Compare "belly buster".

Origin

Early 17th century (in an earlier sense). From belly + bumper.