Kindating is when you date someone based on your and/or their kins. Especially if the kins are commonly shipped and/or in a canon relationship.
"Did you hear? Alex started dating Sam because Sam kins Crona and Alex kins Maka."
"Oh, that's interesting. Do you know why?"
"Yeah, Alex kindates. They like dating people based on their kins."
"Oh, that's what kindating means. I didn't know. Thank you."
A connection with a kin. It's only a term used when you first connect with your kin, like when you first realize the kin is there. It's when you realize your 'kinection' to them.
“ My friend Salem is currently reading things in a kin of their's voice. They did not previously know of this kin, so this is their first kinection with this character.”