The seat or area where you cum the most. Most likely by a computer or bedside.
When I missed school last week I sat on my cum throne all day.
Don't sit there that's my cum throne!
A man (necessarily) that is capable of wielding the Cum Sceptre to its full potential, essentially being able to achieve Godhood via Cum
Nathan: Dude I masturbated 6 times today
Tony: Dude, it's 2 am... You might be a heir to the cum throne!