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whoop

1 whoop /ˈhuːp/ /ˈwuːp/ verb
whoops; whooped; whooping
1 whoop
/ˈhuːp/ /ˈwuːp/
verb
whoops; whooped; whooping
Britannica Dictionary definition of WHOOP
[no object] informal
: to shout loudly in an enthusiastic or excited way

whoop it up

informal
: to celebrate and have fun in a noisy way
2 whoop /ˈhuːp/ /ˈwuːp/ noun
plural whoops
2 whoop
/ˈhuːp/ /ˈwuːp/
noun
plural whoops
Britannica Dictionary definition of WHOOP
[count]
: a high, loud sound expressing enthusiasm or excitement usually singular

big whoop

US, informal
used in an ironic way to say that something is not important or impressive