Contrary to the belief that this word means "cool," it is actually a euphemism, that is replacement, of fuck. Fetcher is used as the insult form, not nessecarily a replacement for "fucker."
Exclamation; game in which a dog will retrieve an object for the one who has thrown said object; adjective expressing positive feelings (see cool or rad); command
"Fetch!"
Roger and his dog played fetch
"Wow, Elaine, that dress is fetch!"
"Fetch!"