Sometimes used by Paramedics to describe someone who isn't oxygenating their blood properly and are literally, visably, the color blue (especially in the face.) Not sure why the color blue is, in this case, associated with boots. None the less, still something that is said.
"That guy was as blue as your boots, with an altered LOC (level of consciousness) and decreased vitals"
The un-easy-ness/discomfort a woman has in her boobs(horny/sexual desire) due to; her man not giving her sex after playing/toying/stroking with her breast or sensitive areas.
Janice: Damn, my drunk boyfriend fall asleep while sucking my tits and rubbing my private part! He fucking gave me blue boobs!
The condition where it's so coldoutside that your boobs turn blue from freezing temperatures. And In severe cases come with hard nipples that can cut glass.