Gateway Girl 

This girl controls sexual access to the girls you want to sleep with. Hot girls will seek her approval before getting nasty with you. You will have to befriend her if you want to get any from the girls in her thrall. What are you waiting for, get on it!

Random hot girl: I met this guy and he's totally dreamy, I was thinking of going to third base.

Gateway Girl: You don't want him to think you're a slut do you? Besides we don't even know who he is!

Gateway Girl by DMonster1356658 May 20, 2009

gateway beer 

From the term gateway drug but referring to beer. A beer that acts as a gateway to drinking tastier, more delicious craft beers. A beer you drink because you truly enjoy the flavor, not just as a reason to get schnockered.

It was drinking Old Spotted Sow that finally turned me away from factory made lite lagers. It was my gateway beer.

I started out drinking fool fizz as a gateway beer. After that I moved on to more hoppy, malty beers. Now I can't drink anything else.

gateway beer by Dr.Dive June 28, 2010

Gateway anime 

Any film, video, or animation, that has had a history of causing normies to take an interest in anime, regardless of where or when it was made.

Pretty much any anime on Cartoon network is a gateway anime.

Gateway anime by TabsTheGreat May 21, 2019

gateway to her guts 

A woman's pussy hole.

"I rammed Victoria's gateway to her guts last night"

gateway to her guts by Chatchi November 11, 2005

Gateway drug

Heroin.

Heroin is a gateway drug. People who use heroin often go on to use methadone or pills.

Gateway drug by Solid Mantis January 26, 2017

gateway game 

A game (esp. role playing) that can lead to 'heavier' and more time-consuming games as addiction progresses.

At first Baldur's Gate was just a reprieve from the daily grind, but slowly I found myself lusting after more rpg's, even pen-and-paper type games. It was at then that I realized I was in the clutches of a gateway game.

gateway game by Necrotaur July 16, 2003

Gateway clean air program

A emissions testing program in St. Louis that requires drivers to have clean and efficient running cars in order to have license plates.
Can be a hassle, espically with older vehicles, and can get costly if you don't pass it.

1. Get your car running yet?
2. Nope. Failed the Gateway clean air program twice now.

Gateway clean air program by Shaun Speers May 17, 2005