If i see someone with there head lights off and o flash mine at them

In Australia it means - police ahead with speed detector

They want to street fight you.

Probably means “thank you for letting me know”.

Thank you for letting me know.

They are saying thank you.

Probably that they're drunk, which is why they neglected to turn them on in the first place, and they're not flashing them at you - they're just rocking to the music.

Cruising. Gay. You're in with a chance, there, Dave! Go for it but remember:[b]No means no!![/b]

Thems saying, Mind your own effin busy ness.😁

It means you don't have long to live. They are MS13 initiates. They drive around with their lights off and they have to kill the first person who flashes them as an initiation into their gang! Seek protective custody immediately! 😨

(Just kidding of course. That was an urban legend going around years ago.)

They're letting you know the deal's on.

Yo! Asked my mum same q once. They're saying thanks and that.

How are you gonna do that when your hands are busy with SW?