蹴り飛ばすって英語でなんて言うの？

ーI would have given you a good hard kick if you were someone else.
「他の人だったら思いっきり蹴ってたよ。」
give ... a good hard kick で「…を思いっきり蹴る」

ーIf you were anybody else, I would have given you a kick in the bum by now.
「他の人だったら、お尻を蹴っ飛ばしてたよ。」
give ... a kick in the bum 「お尻を蹴っ飛ばす」とも言えると思います。

ご参考まで！