Typically found in the homes of the irresponsibly wealthy, a room designated for swimming in mayonnaise.
(The scene: Lord Wealthy's Manor. Doorbell chimes Tik-Tok by Ke$ha. Bulter Jeeves opens door)
Mr. So-and-So: Hello, I'm Mr. So-and-So. I have an appointment with His Grace Lord Wealthy.
Jeeves: Ah yes, Do come in, sir. I'm afraid m'lud will be delayed momentarily.
Mr.SS: Oh, I do hope I am not interrupting anything important.
J: Not at all, sir. M'lud is merely taking his postprandial dip in the Mayonnaisium.
Mr. SS: Ah, I see. Very good then.
Mr. So-and-So: Hello, I'm Mr. So-and-So. I have an appointment with His Grace Lord Wealthy.
Jeeves: Ah yes, Do come in, sir. I'm afraid m'lud will be delayed momentarily.
Mr.SS: Oh, I do hope I am not interrupting anything important.
J: Not at all, sir. M'lud is merely taking his postprandial dip in the Mayonnaisium.
Mr. SS: Ah, I see. Very good then.
by 2curious May 15, 2010
Any sufficiently large gathering of white people; any event where the food provided or brought is expected to be mostly mayonnaise-based.
by DestroFace March 26, 2020