Gopher it (go for it) is a popular saying to encourage someone to do something that is expected to turn out unfortunate for the person. The meme was started in 1999 by a board game called "Gopher It" published by Playroom Entertainment. The description of the game can be read below.

"This children's card game is about gophers collecting their winter food supply.

Each supply card shows one to three apples, carrots or nuts. During their turn, the active player can uncover in sequence up to four cards from the pile. If the same kind of fruit appears one after the other, then all cards uncovered in this turn are lost for the player. Since there are only three fruit sorts, this occurs regularly, so this provides tension both for children and adults.

If a player has more than six of a set, then he loses everything that he collected so far from this set.

If the player has exactly six pieces of a set, the player then receives a gopher trophy in exchange for the set. The first to get his third cup wins the game.

This game is not only pure gambling, but also offers tactical choices so children take part enthusiastically. The minimum age indicated by the manufacturer seems applicable as long as the child can count over six"

The saying "gopher it" was rarley used until june 2007 with the release of Evan Almighty, in the movie God tells evan to build an Ark of Gopher wood and later sends Evan pallets of "Go-4-wood".
It is unclear when the phrase was then morphed into "Gopher It" however it is belived that i was popularized by a Canadian television show called "Corner gas staion" with the name of the season 4 finale being "Gopher it" from there the phrase took off. Now you get out there and GOPHER IT