That dynamic, unique, juggling, complex motion of boobs as a woman jumps, jogs, or walks. The word saves people from saying 'movement of boobs', a rather awkward phrase that usually needs awkward hand motion to get your point across in public.
ex)
A: Do you remember the boobement of Angelina Jolie at the end of Tomb Raider?
B: Yeah, but I personally think the boobement of Pamela on Baywatch had more impact on the general audience.
1. A bruhment spoken by a boomer. The rules of bruhment still apply here, only now if the person committing the actual bruh moment is over 39, it is officially a booment.
2. An extremely powerful boomer moment. You know these when they happen, so you must act appropriately.