What's up
In French, 'Quelle vague' directly translates to 'What wave' in English. It may be used as a question inquiring about a specific wave, such as a wave in the ocean or a wave of emotions. It can also be used when expressing surprise or disbelief about a significant, usually negative, event or phenomenon.
Look, what a huge wave!
This sentence is used to express surprise about the size of a wave. This could refer to an actual ocean wave, or metaphorically, a wave of emotion or other abstract concept.
What a heat wave we've had this week!
This statement comments on the weather, specifically the high temperatures experienced over the course of a week. A 'heat wave' is a period of abnormally hot weather.
What a massive wave of migration!
This sentence is used to remark on the size of a migration, either of people, animals, or data. Here, 'wave' is used metaphorically to refer to a large number of things happening at once.