Definitions

1. noun

a person who makes loud, boastful, or impressive claims

“He was a whooper at the party, claiming to have broken multiple world records.”

2. noun

a large, loud-voiced bird, especially a swan or a Canada goose

“The whooper swan is a large, migratory bird found in many wetlands.”

3. verb

to make loud, boastful, or impressive claims

“He whooped loudly, claiming to have completed the marathon in record time.”