The act of tucking in only half of the front of your shirt, in a conscious effort to appear accidentally fresh. Often seen with buttown-down shirts, but also possible to implement with a polo or t-shirt. Popular in the bro and hipster communities.
Undo that fuck tuck, Eric, it's not accidentally fresh if you do it on purpose.
a funny way insult someone
shut u stupid fuck tucks im gonna fuck tuck you!