What's An Oubliette?

What's An Oubliette? a song by Parker & Lily on Soniditos

Two Years In Air by Parker & Lily ,
Mandarin by Parker & Lily ,
My Golden Arm by Parker & Lily ,
P.S. by Parker & Lily ,
Waitress by Parker & Lily ,
Tokyo by Parker & Lily ,
Desert Holiday by Parker & Lily ,
Morley by Parker & Lily ,
Only Heartbreak For Me by Parker & Lily ,
The World On Time by Parker & Lily ,
What's An Oubliette? by Parker & Lily ,