One of the most offensive French insults. Literally meaning: "Go Fuck your Mother".
One doesn't have to know the person's mother or hold any grief against her to deliver the insult.
Presumably what Materazzi told Zidane before receiving a well-deserved head-butt during 2006's FIFA world cup.

A Bloomer is someone with a bright outlook on life who is optimistic in nature. Bloomer's frolic in every opportunity to be happy and try to make the most out of life. The opposite of a Bloomer is a Doomer. The term Bloomer originated specifically as a counter to the Doomer on sites especially like 4Chan.