This is the term describing one with
erect nipples due to the
cold, or
arousal.
It comes from the misinterpretation of what lies beneath another's shirt. Once one assumes (presumably falsely) that the firm points under the cloth are in fact peas, they may be led to believe that the reason one would put peas two-at-a-time (three if you're lucky) in their shirt would be to smuggle them (be it to the garbage can, or to another in greater need than themselves).
I heard this first this week from a friend from Prince George. She is surprised that I have never heard it. I wonder, then, if it is a PrinceGeorgism.