Cockles
From Super-wiki
Cockles is a "pairing mashup" - a portmanteau of (Misha) Collins and (Jensen) Ackles - used to indicate those characters are Slashed in a fanfiction or other fanwork. It tends to be used in crack rather than serious sense. However as a Slash mashup name it is rather awesome as it contains the word "cock".
Jensen/Misha fic is a niche pairing in a genre dominated by J2