A periodic element with an atomic number of 321. In it's liquid form, can make people become silly, and/ or dumb.
She drank so much siliendum last night that she became silly and dumb.
by ChoppyStix February 09, 2013
Type your email address below to get our free Urban Word of the Day every morning!
Emails are sent from firstname.lastname@example.org. We'll never spam you.×