There are two ways to install WTF:
Get this repo and install the dependencies:
go get -u github.com/senorprogrammer/wtf cd $GOPATH/src/github.com/senorprogrammer/wtf make install make run
and that should probably do it.
As a Binary
Grab the latest version from here:
expand it, and
cd into the resulting directory. Then run:
and that should also do it.