Gateway Friend 

That one friend of the group you want to be a part of, may be the ugly one or fat one. They instantly accept you due to low self esteem and you then take steps to move from fatty or ugly to the attractive ones or fun ones.

J: Hey I'm hangin with Lisa after work
K: Eww dude, shes like 350 lbs!
J: Don't worry, shes just my Gateway Friend. I'm getting closer to Vanessa and Kylie

Gateway Friend by Santiago Falcon April 24, 2009

gateway friend 

the friend other people use to get to someone they want to talk to, be with, date etc.

She is using her as a gateway friend to get to her guy friends.

gateway friend by peders July 14, 2012

Gateway Friends 

People that you are only friends with because they are close friends with one of your friends.

Hey are you hanging with Jack?

No! Him and I are only gateway friends. I would only hang with him if Tony was here.

Gateway Friends by Theman4408 October 13, 2011