The compacted fecal matter which is the first to pass before the softer normal fecal matter
This can be caused by holding onto the poo for longer then you should. Cuasing the colon muscles to compress the fecal matter. Squeezing water and pushing it backwards back up towards the intestine.
Fecal matter after the initial steel head can be more runnier (softer) then usual.
Although it has happened for no reason at all. Its more commonly caused by holding on for to long or not enough water intake
"Hey man, why the sour look on your face?"
"Just had this massive steel head.."
"Allan had a huge steel head this morning, poor bloke"
variant of meathead. Generally applied more often to football players or used self-derisively by more intelligent meatheads to show that they do have some trace of creativity.
"We can't have Scorpion Bowl this year because we're a bunch of steakheads and we broke them all"
-Football player, lamenting his fraternity's inability to hold their Scorpion Bowl party.