This phrase is a humorous and colloquial way of suggesting that someone may not be fully rational or is a bit mentally sluggish. It evokes the imagery of a picnic, which typically involves multiple sandwiches, implying that the person in question is missing something fundamental, akin to being incomplete or a little out of sync mentally. Such expressions, while often used lightheartedly, also reflect societal perceptions of intelligence and behavior, sometimes bordering on insult. Understanding this helps us recognize how language can be both playful and pointed, and how cultural idioms shape our communication. It also highlights the importance of context; what might be a casual joke among friends could be perceived differently depending on the setting or relationship. Moreover, it underscores how people use imagery in language to convey complex ideas succinctly. Recognizing idioms like this offers insight into cultural humor and societal attitudes, making language a more vibrant and meaningful part of human interaction. When considering its usage, it's essential to be aware of the potential for misunderstandings or offense, and to use such expressions thoughtfully, appreciating both their humor and their implications. Thoughtful dialogue involves balancing the richness of idiomatic speech with sensitivity to others' feelings. This phrase encapsulates human tendency to simplify complex ideas into memorable, often amusing expressions, thus enriching everyday conversation.

---Lance Bass---