(idiomatic) an expression of congratulations, encouragement, or approval in American English. Not in common use outside of the US. <DL><DD>The team finished ahead of schedule and under budget. Way to go! </DD></DL>
Noun way to go
A route, course of action; a preferred decision or choice. <DL><DD>They are about the same quality, so if you can get a discount on the color you like, that would be the way to go. </DD></DL>