Seriously the maddest insult one can unleash on another, commonly used among children of two years of age.
Timmy: Oi John, Your mum's a sket.
Bobby: Shut up you silly billy poo head.
by fr1ck February 26, 2018
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A person that is never, not having a good time.

Even though they are most likely intoxicated, they lead the charge in some of the most intricate conversations.

They are not political, mostly because they are living in the "NOW".

They don't often make mistakes, but when they do, it always leads to an amazing opportunity that maximizes the collective's time.

Most likely to be the best-man at a wedding and leave with the line of bridesmaids.
Look at that Billy Head over there, he just chugged a bottle of Jager, disappeared for 3 minutes, and started a conga line with 30 smokeshows.
Are you going to the Billy Heads' tonight? I heard they boxed their whole house last weekend.
by TrevorShanton August 29, 2020
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