noun
grilled offal; hormone grill
A dish of grilled beef or pork offal (intestines, liver, etc.), popular in yakiniku and Korean-style barbecue. The name is a pun on 'hormone' and the Osaka dialect word 放る物 (throwaway parts).
今夜はホルモン焼きを食べに行かない？
How about going out for grilled offal tonight?
The grilled offal at this restaurant is fresh and has no unpleasant smell.
もつ鍋 is a hot pot dish with offal, whereas ホルモン焼き is grilled.
From ホルモン (hormone) + 焼き (grilled). The 'hormone' part is a pun on the Osaka dialect 放る物 (hōrumon, 'throwaway parts'), referring to offal that was traditionally discarded. The exact origin is uncertain but widely accepted in popular culture.