Every parent who's just spent the school holidays at home with their kids will tell you they've heard them laugh, or joke about, "6-7".

Now, a lot of us grew up in the generation of the combination of "69" earning sniggers and giggles anytime it was mentioned at school, but that's old news now.

The surprising thing about the "6-7" meme which has gone viral is that it really doesn't seem to make any sense.

What does '67' mean?

For those who have not been introduced to the viral meme yet, it involves saying "six seven" and often adding a double hand gesture like weighing up two options.

Kids are shouting it in public and in classrooms, and the meme has even popped up in a recent episode of South Park .

But the issue a lot of adults seem to have with it is that, well... it just ma

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