absolutely. That explains the highest per capita consumption of beer in the world.
One might note: "Ahoy" was how telephones were initially answered when they first came out in America.
Pro tip: Another slang modification is "Hoj!", but use it only with your drinking buddies or close friends. Also, while not grammatically correct - you can use the plural form "Ahojte!" when greeting many friends. And "Ahojky" or "Ahojík" is another not grammatically correct word, however, it is a cute way of ahoj, but use those ones only for small kids or if you are a woman, it sounds weird from a man.
And if you as a teen want to look cool among your teen Fb friends you write it ahojki.
And normal people really say casually 'čau' or 'čest' - but don't say 'čest' to anybody you don't know lol
Warning for others: čest is a short for Čest práci, the greeting among communist. It may be understood as a joke ... or not. I can't confirm we use too often...
Čau ... at least don't use it for people you don't call by their first name. It is more subtle, but at least this.
But if I am a card-carrying member of the KSČM am I okay to čest others? What about amongst KSČM members themselves?