a guy is 'un gars' (familiar) or 'un mec' (more slangish) in French.
Mon gars means something like guy, chap
gars
un gars malin
vous êtes mon meilleur ami > you are my best friend 'un gars' - plural 'des gars' means "guy / guys" in French.
mec(m_eh_ke) or gars(ga)
The phrase 'bon gars' is a shortened form of 'bon garçon'. The word means good guy. The ending '-rs' of 'gars' isn't pronounced. So the word is pronounced as follows: gah.
les gars, vous nous manquez.
guy just like in english but man is l'homme
ça va les gars? (pronounciation: "sa va lé ga?")
les gars les hommes - as in men les gens- as in people
Allez les gars - go on lads