This is an insult aimed at people who get a stupid fucking line in their head when they go for a haircut. This insult is usually aimed at fat people who think they’re road but they’re just fat.
Will- “my new haircut looks sick”
George- “fuck off you fat trench head”
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When wearing headphones for a long time, you get a strip of flattened hair that goes across your head that resembles a trench.
I've been gaming for so long I now have trench head
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Similar to trench foot.
Someone who acts like an idiot/in a stupid manner.