"(as|) full as a tick" の定義と意味

What is the origin of the idiom "full as a tick" and when to use it?

The idiom "full as a tick" is an informal expression used to describe someone who has eaten to the point of feeling extremely full or satiated, often to excess. The origin of this phrase likely stems from the observation that ticks, blood-sucking parasites, become engorged and swollen when they have fed to capacity, making them appear "full" and bloated.