Only if you booyah for your team mate's booyah bombs! Other than that, they can't see your booyahs.
I usually booyah a lot in a game, like at the beginning of a match or if my team mate does something good. I'll also booyah if I trade/die and no one is around me. I booyah when my friend on the other team kills me even though they can't see it

In SR I'll booyah if I see people lure/do common SR strats to encourage them hopefully, and during goldie seeking.