Chaps -- The cologne that cowboys slap on whenever they ride down to the trading post to pick up a heap o' styling gel! It was the cologne of the great Western heroes, who slapped it on, despite the dangers it presented. ("How come those dadburned Indians always seem to know where we are?")
I'm assuming the "Chaps" they're talking about is the abbreviated version of the word "chaparal" which are the heavy leather leggings cowboys would wear over the front of their pants to prevent their jeans from getting ripped up while chasing cattle through thorny brush. The phonetic pronunciation of this word is "shaps".