“Too Big For Your Britches”
Let’s start with explaining what the word britches means: it’s your underpants. So this expression doesn’t actually literally mean you’re too big for your underwear, but that you’re getting ahead of yourself or that you think way too much of yourself.
“Too Big For Your Britches”
“Full As A Tick”
We’ve all experienced the sensation of enjoying our food so much that we continue eating until we’re uncomfortably full. You might hear someone in the south say that they’re “full as a tick,” which might sound odd unless you’re familiar with the little bugs. After they enjoy chomping on people (or animals), they tend to balloon up, full of the blood they’ve just sucked. So, while this isn’t so pleasant to think about, it’s actually a good comparison.
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Full As A Tick