boyfriend chameleon 

changing your life / lifestyle to match that of your new girlfriend. matching your girlfriend's likes and dislikes and forgetting yours

James is a boyfriend chameleon, b/c he used to drink and jerk off to the iPhone, but now he doesn't drink and has a blackberry b/c of his gf.

boyfriend chameleon by jgp021979 December 2, 2010

Boyfriend Chameleon 

Noun: When a male changes his interests, hobbies, and lifestyle to match his girlfriend's interests.

Jake is such a boyfriend chameleon! He use to hate and make fun of the hipster style, but now that he's going out with one, he changed his entire wardrobe and became a hipster himself!

Boyfriend Chameleon by JntKbwy September 22, 2011

Boyfriend chameleon 

The act of changing said hobbies, characteristics, opinions, interests, and views in order to be more appealing to your partner.

Aka : Blending into the background of the relationship to the point of becoming the same sex.

Girlfriend: I can't wait to go to Europe!
Boyfriend: don't leave me we have so much in common!
Friend: don't be such a boyfriend chameleon, get your balls back!

Boyfriend chameleon by Titty milk 2000 February 5, 2017

Chameleon Boyfriend 

A buddy that gets a girlfriend and conforms to everything she wants and goes everywhere she goes.

Dude what's up with him getting a new girl and turning into a chameleon boyfriend. I remember when he used to ask waitresses if he could lick their asses....dudes whipped man!!!

Chameleon Boyfriend by Batshouse March 9, 2017