No.1 Excuse my french = Pardon my French

Phrase mumbled insincerely immediately after or before one swears a blue streak within earshot of the elderly, the young, or the simply uptight

在人滔滔不绝的咒骂或说脏话前后不经意的咕哝的一句话（一般有老人或者小孩子在场的情况）

→swear /swer/诅咒；咒骂；发誓

→to talk a blue streak：滔滔不绝的说话

- Mrs White always talks a blue streak.

-怀特太太总是一开口就滔滔不绝。

No. 2

 "Pardon my bad language, or forgive me for swearing."

French在这里等于bad language和swearing.

Excuse my French

抱歉我说脏话了

例句：

- What a jerk! Excuse my French.

-这简直就是一个傻冒！不好意思我说脏话了！