A combination of "chill out" and "calm your tits." The tits are calmed so much that, in some cases, they actually start lactating.
Girl: "BITCH BITCH BITCH BLAH BLAH BLAH"
Guy: "Woah, chillactate, you're being a bitch."
v. - the act being extremely relaxed while simultaneously breast-feeding an infant. (often with the aid of marijuana)
Brittany chillactated for 3 hours after hitting the blunt.