A phrase meaning 'even more mature than normal' .It can also be a way to discribe people who are really imature as in:YOUR ABOUT AS MATURE AS CHEDDER CHEESE!!
by bobmcbobbill May 19, 2009
"I sent my girlfriend down to the store to pick up some white chedder cheese whiz."
"Mark, that's dirty."
"Mark, that's dirty."
by Shai November 21, 2004