A portmanteau of the names of the 2008 Republican presidential and vice presidential candidates: John McCain and Sarah Palin.
"Brangelina. Richandamy. Now . . . McCalin."
A combination of two sub-standard persons or items in an effort to make them appear more worthy of someone's attention.
They make a bad couple - he can't count and she puts lipstick on dogs; they're such a mccalin.