Le's go boys

Hi Sami, 

You would say :

'Allons-y, les gars, on est en retard !'

Take a look a the following lesson for the imperative form of nous in this case -

https://kwiziq.learnfrenchwithalexa.com/revision/grammar/how-to-use-y-with-affirmative-commands-imperatif

Hope this helps!