Easy as pie? Not quite
"Let's hang out."
A simple idiom understood and used regularly by Americans.
Now try looking up the phrase word for word. Let: to allow or to permit. Us: the objective case of we. Hang: to fasten from above. Out: away from the inside.
"Allow we to fasten away from the inside."
That may be the reaction by an English Language Learner using a handheld translator to understand the sentence on the go.