It's one of those jokes that's so funny it sort of gives you a slight boner. Like the first time you heard "jizz in my pants", you were so entertained by it that you sort of got a mind boner - just a very pleasant feeling.
It's also going the extra mile to proclaim love for a joke. Usually people just caps-lock lmao to show their love. This really goes the extra effort - it's 4 extra letters. Plus, it's a ridiculous image when you literally think about it.
"I guess, like, maybe, my mom, like, just found hella nude pictures of myself that I took for Playgirl."
"It's not a joke! It's my life!!"
"You're a horrible friend!"