I've just randomly come across this trending on Twitter, and while it started at least months ago on Tumblr, it seems to have only really taken off in the last few days.
The earliest I've found is this Tumblr post from November 15, 2016, which says this:
┏┓
┃┃╱╲ In this
┃╱╱╲╲ house
╱╱╭╮╲╲ we love
▔▏┗┛▕▔ & appreciate
╱▔▔▔▔▔▔▔▔▔▔╲
Hunk Garrett
╱╱┏┳┓╭╮┏┳┓ ╲╲
▔▏┗┻┛┃┃┗┻┛▕▔
This is the general format most of the early Tumblr posts followed, more of which can be found on the in-this-house-we account, which has been running since February 28.
However, its recent surge on Twitter usually follows a shortened form of just "in this house we…" seen below:
┏┓
┃┃╱╲ in
┃╱╱╲╲ this
╱╱╭╮╲╲house
▔▏┗┛▕▔ we
╱▔▔▔▔▔▔▔▔▔▔╲
[your text here]
╱╱┏┳┓╭╮┏┳┓ ╲╲
▔▏┗┻┛┃┃┗┻┛▕▔
You can find plenty of examples by searching in this house we on Twitter, and more are being posted all the time.