When you're doing a girl, you suddenly yell "ACH" and have twenty friends run in wearing kilts and then gangbang her until you all jizz inside her.

From then on, you refer to her as "haggis"
Girl: Did you really give martha the Scottish Army the other day?
Guy:Who, Haggis? Yea that was pretty fun.
Girl: She's in the hospital.
by BTLighting February 2, 2011
Get the The Scottish Army mug.