Kindating is when you date someone based on your and/or their kins. Especially if the kins are commonly shipped and/or in a canonrelationship.
"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 datingpeople based on their kins."
"Oh, that's what kindating means. I didn't know. Thank you."