CHOOOO

What the picture shows

A cartoon steam locomotive with a dark grey boiler, yellow stripes, red cab and wheels, and a grey puff of smoke, whose cab window contains a distorted photo of a screaming cat's face. Chatters likely use it to signal that a hype train is rolling or that something is about to take off at full speed.

No measured meaning yet. Used 7 times in 4 channels this month; one is written once chat gives enough evidence.