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We plan to have a thumping good vacation.
"exceptionally large," colloquial, 1570s, present participle adjective from thump (v.).
1530s, "to strike hard," probably imitative of the sound made by hitting with a heavy object (cf. East Frisian dump "a knock," Swedish dialectal dumpa "to make a noise"). Related: Thumped; thumping.
1550s, from thump (v.).
Especially great; also, large: thumping good time (1576+)