WTFIMA stands for WTF Its Monday Again. Often accompanied by an exclamation mark at the end, it is used to express frustration that the weekend has passed by too quickly for one's liking.
First used by a group of friends on the sunny Island of Singapore. They were inspired by the acronym TGIF while suffering from the Monday blues. Lo and behold, WTFIMA was born!
WTFIMA!? I barely enjoyed my weekend!