Cockbottom doesn't really have any meaning at all, you can use it any situation good or bad.
But Remember - It's different in meaning from the slang cock bottom
She ate all my cereal, she's a cock person.
Or
Dude I love her so much, she's truly a cockbottom person.
Or
I don't really believe in any religion, cockbottomism is the way to go.
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.