Bull hanky can be defined as an alternate noun used in the place of word such as bull crap or bull s**t. It came from a child that once referred to her snot as crap, and thus came bull hanky.
"Do you know what Bill said the other day, Casey?" "No I don't, Jill." "He told me that the Einstein was an idiot." "That's a bunch of bull hanky, Jill."
by Whoever the heck I am June 19, 2008