One Direction will soon be embarking on their first-ever U.S. headlining tour. The British imports will take their mop-top, sunny pop tunes all across our great land.

Before they hit the road, MTV News caught up with the fivesome in New York City, where they performed on "Saturday Night Live." The guys revealed some key British slang terms American girls might want to learn to impress them.

To get you in-the-know before your next One Direction concert, the guys broke down key phrases to use in conversation: "Trousers" are pants, per the guys, and a "jumper" is a sweater, and therefore possibly a good thing to wear with trousers.

Louis Tomlinson said "fit" is a key word to describe an attractive person, explaining, "If a girl's fit, she's hot." One Directioners might use "fit" to describe the "blokes" in 1D: "He's a nice bloke," Liam Payne said of the term for a guy. On the other end of the spectrum, Harry Styles let us in on a word for a special lady and romantic interest. "Quite slangy," Harry explained, "but if someone was your girlfriend, you'd be like, 'That's my bird.' "

And, finally, "sithee" means "see ya" or "goodbye." That will be perhaps the hardest thing a Directioner will say to one of the guys if they should meet them during their outing this year.

The tour will kick off May 24 in Fairfax, Virginia, as part of a North American tour set to wrap up July 1 in Fort Lauderdale, Florida, with stops along the way including Chicago, New York, Atlanta and Las Vegas. They are also set to take the stage at New York's famed Madison Square Garden on December 3.

The guys' debut album, [article id="1681495"]Up All Night[/article], which features their lead single, "What Makes You Beautiful," is out now.

Share your favorite British slang in the comments below!