1- expletive- literally meaning two large noses, usually yelled after a painful incident, after the sight of something amazing or an uncommon incident.
2- noun- commonly used when one thinks another is lying
1) Beshonnzle! Dude check out those siamese twins, I have never seen anything like that before.
2) Dude, that's complete beshnozzle, it is impossible that you saw your cousin getting banged by my dad last night.