* It's a regional slang term: Some terms are specific to certain areas or communities. It's possible this is a local slang for something related to trucks.
* It's a misunderstanding: You might have heard something incorrectly, or the term is part of a joke or a specific group's inside language.
* It's a mispronunciation: Perhaps you are thinking of a similar-sounding term.
Could you please provide more context or information about where you heard the term "truck suzies"? That would help in understanding its meaning.