How do you talk like a guy?

my bestfriends (a guy and a gurl) are trying to set me up with my exboyfriend who still has feelings for me so i made up a fake boyfriend. at first they believed me but after a bit they started 2 grow suspicious why there was noo info about him so i made a fake msn account and chatted with them. the girl was easy 2 convince but the guy was harder since i kept slipping up and speaking all girlieish so how can i fix tht. i dont evn know wat 2 talk about. any help?