An insult against a group of people who are being stupid and you're not a part of it.
This is a reference to treatment of sludge generated by wastewater facilities, the pump gallery is where you watch thickened concentrated sludge be digested by micro-organisms.
Bob watches as cars continuously slide down an icy road and crash after not heeding anybodies warning or slowing down.
You begin by combining your cum with cow shit. You then freeze this new liquid into solid form. You finish by telling a friend that is a new type of ice cream. Warning: only allow friend to eat 2 scoops - anymore is considered deadly.
When Mike pulled The Silly Cow Sludge on Kevin, he forgot the two scoop rule and thus killed Kevin