Hanky-Code
The Hanky-Code is an encryption, which correlates some colours with sexual practices. Mostly a handkerchief will be used, which decorates your backside pocket. Coloured armbands are used for the same reason.
Who wears his hanky or armband on the left side, will show us, that he prefers the active part. The Code means in this case »I offer«. When a guy wears a mustard colored hanky in his left backside pocket, you may estimate, that he wears a really meaty cock in his jeans.
To prevent, that you’ll get wet, you should be able to differ between mustard and yellow, also in dimly bars and with blacklight.
Accordingly to this the meaning of right is »I look for«, »I am passive in this practice«. Our mustard colored hanky in the right back pocket thus means, that the guy looks for a fat one.