It has two meaning:
1. Fake iKuns that truly love a random dude named Cai Xukun and would pay for his songs, mostly 6 years old. don't talk with these people or you become gay.
2. True iKuns that would post video of Cai Xukun playing basketball on Bilibili and practise his dance moves, these are good people love Cai Xukun from their souls.
A: I love Cai Xukun, he's a nice guy, stop hating.
Me: Fake ass iKun.
B: I love singing, dancing, rapping and play basketball, music~.
Me: We are family.