They are kisses sent over a text format, which can be said to friends, family, lover. Sounds less awkward to say Hershey kisses than sweet kisses to someone you like but don't want to sound flirty.
When your boss or co-worker sits around with their thumb up their ass all day doing nothing. Once it's time to go home they remove their thumb which the tip is brown, coated in doo doo, resembling a Hershey Kiss. Sometimes they have poor hygiene and toilet paper is stuck to it as well representing the niggly wiggly completing the appearance. In many cases of frequent laziness and constantly doing nothing the thumb will be permanently stained from the feces.
Hey Joseph you got another piece of candy I see you have one already? Nah Levi I been hiding in the back doing nothing as usual. My fingers are just stained and have the ol' Hershey Thumb now.
When your wife, girl friend, or secret mistress french kisses your butt hole after you've went a few rounds with the toilet from some spicy tacos.
I was surprised when my wife asked me to allow her to give me a Hershey's Kiss. I ate some really spicy tacos and blew up the bathroom. I dropped my pants and told her I was ready. I didn't realize it was valentine's day and she meant chocolates...