The origin of this phrase (Which means excuse my use of profanity) does not originate for the French word for seal, as Lazy Time Waster suggests.
It in fact originates from the constant warfare between England and France many years ago, at that time "French" was associated with indecent things and activies (Swearing, kissing etc).
This was done fairly often in those days, sexually transmitted diseases (for one thing) had different names in different countries.
What the English might call the French disease, the Dutch might call the Spanish disease, the French might call the English disease and so on.
An excuse for using profanity.
As said in the 1986 movie, Ferris Bueller's Day Off,
"Pardon my French, but Cameron is so tight that if you stuck a lump of coal up his ass, in two weeks you would have a diamond." or "Pardon my French, but you're an asshole!"
An apology for using profanity (and casual national insult).
Fuckity, fuck, fuck, fuck. Pardon my French.
phrase used as an appology for using profanities. The word for "seal" (the animal) in french is "phoque," which is pronounced the same as the word "fuck" in english. This is how the phrase originated.
You've got to be fucking kidding me! Pardon my french, but that's insane!
Je can't speak-ay le Frances. Pardon my French.
When you stick your cock up a girl's ass (or keister) without asking her. Then, she gets angry and says stop but you continue for at least 15 more seconds until stopping. Then, you pull-out and say Pardon My French.
Pardon My French Guy 1: I stuck it up this girl's Keister last night it was tight! She must have wanted me to stop cause she was screaming stop!!!! But i did'nt stop right away i kinda ignored her for 20 seconds or so.
Guy 2: Sometimes you gotta go with the flow and just stick it up the poop shute.
Guy 1: Ya, i know what you mean. I hope that she can Pardon My French.
Je n'ai pas francais. Pardon my french.
Shit ass wigga