OK, I looked it up:

The definition of “boykisser” is basically what you think it means: someone who likes kissing boys. It’s used mostly by LGBTQ+ meme people as a way to both make fun of and support their friends who like kissing men.

yeah, I think this boykisser meme is more common in the femboy, gay, and transfem egg / early transition / pre-transition community

probably stems from the homophobic climate, that boys shouldn’t kiss boys - so it leans into the taboo while affirming it subversively (the meme implies boykissing is shameful, while playfully implying it’s a good thing).

I have a hard time seeing this meme applied to straight people, i.e. implying women or girls are the boykissers (and the application to trans women seems to be more for trans women who are still treated as boys by society, for whom it’s still subversive to kiss boys - though it is obviously straight for a trans woman to kiss a boy, that’s not how it might commonly be viewed).

Though maybe applying this meme to straight women would be an ironic status-quo defending subversion of the meme, so I wouldn’t rule it out 😆 If conservatives were creative and had better meme-game maybe they would have exploited it that way 🙃