It's not Mike, it's Mieke
Other funny quotes from Eurotrip:
"Hey, Mieke. 'Dear Scott, I was verry sad to hear about your lady woman Fiona dumping you. Since you no longer have a girlfriend, maybe I could come to America and we could get to know each other better. Perhaps we could... zussamen.' What the hell is 'zussamen'? 'Arrange a meeting.' No, no, no! Come on! Cooper was right. This guy wants to have sex with me. Listen, Mieke. I don't want to arrange any meetings with you, you sick German freak. So please keep your hands off my genitals, and never write to me again, and don't come to America. Goodbye."
Bert: "Wow. I can't believe this German chick wants to come here and hook up with you."
Scotty: "I don't think so, buddy. Mieke's a guy."
Bert: "Uh, no, it says right here, 'trauriges madchen.' 'I was a sad girl to hear about Fiona.' ****in' A, Scott. I'm taking intro to German, and even I know that."
Scotty: "Come here. He sent me a picture, retardo. See? That's a picture of Mieke and his cute cousin, Jan."
Bert: "No, retardo. That's Jan, a man's name, and that's not 'Mike,' it's 'Mieke,' a common German girl's name, similar to our Michelle. I hope you wrote her back and told her to come visit."
Cooper: "Hey, Mom made waffles. What's going on?"
Scotty: "I'm in love with my penpal. I'm in love with Mieke."
Cooper: "You know what? I was actually expecting this. And frankly, listen, I'm flattered you picked me to come out to first. And don't worry about telling your folks, 'cause, uh, I think they already know."
Scotty: "No, you idiot. Mieke is a girl."
Cooper: "No, no, no, I get it. Yeah. He's the girl, and you're the girl, and sometimes you're both the girl. Right? Right? That's hot. But, you know, whatever works for you. I'm not gonna judge it."