Lyric discussion by Sean_harrington 

He doesn't hate women, or even fat women. He mentions them because many gay, and semi-gay men end up with fat girls. I don't know why, but it happens.

He wants William to make the right choice, not just give in and get married, because it's expected of him. He knows William knows better, but is just following the plan.

i read in Rolling Stone that the song is about a love triangle...i've no idea about this Billy Liar stuff but i just thought i'd add that :)

Yeah. The "fat girl" thing seems mean spirited, but I always felt it was a mock-catty remark about a girl the protagonist is jealous of, sort of making fun of the way some gay guys can be. "Go ahead and marry your fat fag hag, waste your life, see if I care!" (Yes, I indeed think this song is really super gay. Most of his lyrics aren't necessarily, but this one is.)

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