The place of ultimate suckiness. The original suckiness from which springs all other suckiness in the world. The black hole of suckiness. Used by Marines as a nickname for the Marine Corps. It sounds like a put-down, but it is actually a testament to the dedication of those who endure it for the rest of us.
"Welcome to the suck." Used after initiation of a new recruit. Also used by any marine upon realization that a new, deeper, previously unreached, level of suckiness exists.