One version of gay is very similar to naff. From the Urban Dictionary:
British slang, today meaning uncool, tacky, unfashionable, worthless… or as a softer expletive, in places where one might use “fuck” as in “naff off”, “naff all”, “naffing about”.
Origins of the word are disputed, but it appears to have come from Polari (gay slang), used to dismissively refer to heterosexual people. It was introduced as a less offensive expletive verb (“naff off”) in the ’70s UK television show, Porridge. “Naff off!” was famously used by Princess Anne in 1982.
Naff the naffing naffers.
British slang, describes something that is stupid, lame or unpalatable.
That party was naff — they ran out of beer, and the people were way too uptight.
Of poor quality – in particular, tacky or obvious in some way.
That song is SOO naff.
Ironically: gay slang used to dismissively refer to heterosexual people.
But the expletive version doesn’t fit, “gay the gaying gayers” doesn’t have the same ring to it.