He used to get flamed for it but most of us came to respect his commitment to being the best mangina he could be, according to his code.  He's kind of a unique character in a number of ways. If all manginas were more like scoed they would not be as universally despised by the rest of us.  He does not come to this board often, but if he does perhaps he'll enlighten you

noun:

    A male feminist, or a male supporter of feminists (e.g., Scoed, Phoenix Dave)

    Last edited on May 04 2013. Submitted by Anonymous on Jul 06 2012.

other:

    A derisive term for a man with a pronounced feminine side, or a weak masculine side (e.g.,  Tiddies)

    Last edited on Feb 24 2012. Submitted by Anonymous on Feb 24 2012.

Btw, I'm the "anonymous." :

Because in response to a post about that we hobbyists should be nice to the providers we see, I said "we should be nice to everyone regardless of what they do for a living until they give you a reason to not be nice". So the paint brush they use for throwing that word around is quite large

It mysteriously disappeared and the site I made it on, is gone too.

Since my junk don't do that stuff, nor anything else, I guess the GB definition will have to work for me:
Mangina (MAN jy nuh)  n.  
1) A male contributor on TER boards that doesn't give into the pack mentality of dog piling onto women just because it's always been done that way.  
2) A male contributor on TER that thinks every woman deserves to be able to speak her mind (no matter how logical or BSC it may be) and not get assfcked for it.  Unless it's really jacked up.  It sure doesn't need to be a sausage fest or that would be really fcking BORING.  
3) Someone who doesn't really care what everyone else thinks, because it's my fcking opinion.  
4) You are what you eat.  I love the 'gina any way I get it