Let go and Whoop it up

Let go verb - Release, as from one's grip.

Whoop it up and let go are semantically related in celebrate topic. In some cases you can use "Whoop it up" instead a verb phrase "Let go", when it comes to topics like revel, have fun.

Whoop it up verb - Celebrate noisily, often indulging in drinking; engage in uproarious festivities.

Let go and whoop it up are semantically related in celebrate topic. Sometimes you can use "Let go" instead a verb "Whoop it up", if it concerns topics such as revel, have fun.