snow plougher 

Someone who does a lot of coke, usually yours.

Johnny is a real snow plougher. He Hoovered my eightball this weekend.

snow plougher by The Dinger August 7, 2017

snowploughed

The process whereby one's own plans are shunted aside to make way for what someone else wants to do. The offender's act(s) can often go unnoticed, and "snowploughed" can be uttered (most commonly as an interjection) to make them (and anyone else around who will listen) realise just how appalling their selfishness really is.

M: So you guys want to go to McD's?
All: Yeah, why not
(Enter S)
S: Let's all go somewhere completely different for lunch today!
All: Yeah, why not
M: *sigh* .. snowploughed

snowploughed by MS March 27, 2005