While crouched over your partner and receiving a hummer you defecate on your partner's neck, hence a brown bow-tie. Note that the person delivering the brown bow-tie must be facing his partner's head, lest he deliver a brown sombrero.
"While Sarah was giving me a hummer last night, those refried beans kicked in and I couldn't help but give her a brown bow-tie!"
by TheSinkingSpell July 1, 2009
A shit stain left on the torso area between the tits and stomach of a women after titty fucking her with a dirty asshole.
I titty fucked Donna last night and when I finished cumming on her neck I got up and noticed I gave her a brown tie.
by John F. Arts July 27, 2018