"Ano, my jsme kluci."

Translation: Yes, we are boys.

[DevilInThe]

Hillarious for Polish ears, because "kluczy" (Polish) are "keys". False friends ahead!

[PetrKryze]

keys in Czech are "klíče", so pretty close! :D

[Dan_Cosg]

kluk == child, but kluci =/= children?

[Merwabi]

As @cathnog said, kluk == boy, and kluci == boys. Croatian, also a Slavic language, has a sound change called "sibilarizacija" (assibilation). This means that in some cases "k", "g" and "h", when in front of "i,"will change to "c", "z", and "s", respectively. I can't find the rule for Czech, but I believe it's at least similar, if not the same. It can sure be applied to this case: kluk + i = kluci. Now let's hope some native Czech speaker replies and confirms this...

[kacenka9]

i am a native speaker. But this is a rule that is very hard to confirm exactly because I am a native speaker. You do not think of stuff like this when it is your native language. It just is :D

That said, every masculine ANIMATE noun I can think of that ends in K in singular ends in CI in plural.

Žák = Žáci (pupil, student)
Novák = Nováci (common last name)

INANIMATE change to KY

Mák = Máky (poppy)
Hák = Háky (hook)

[Titovskii]

If "kluk" is an masculine animate, then why do we use "my" but not "mi" in plural?

[VladaFu]

"my" means "we" here