A compound of Christmas and Chav
It mostly consists of lights and occasionally moving objects, waving santas, reindeer etc.
Mostly seen in the suburbs of Romford such as Gidea Park, Upminster and Chadwell Heath
"What you doing for Chavmas Kev?"
"Dunno Barry but I love Chavmas, what you doin for Chavmas?"
"Mostly getting minging, mostly!"
Usually involves spending your entire job seekers allowance on poundland decorations. Putting your tree up far too early and putting trampy lights all over the front of your house.
Yes, she celebrating Chavmas