Could it have been pocket fuzz? I just can't imagine liquid collecting in there like that, particularly on one of the Cherry Vape tips with their bigger center hole. However, if a pv drops down to lie sideways on the bottom of my pocket, more often than not there will be some fluff inside the hole of the tip when it's brought out (somehow, it's always in the tip, not the catch cup).
Not that pocket fuzz is any less gross than dried liquid mixed with bits of *us*, but it's the density and the near-complete blockage you describe that makes me think it's not just liquid.
Oh, and the Pawn and Ming I purchased about two months ago each had one o-ring.