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This phrase means that a person is lacking in intelligence, not through any form of retardation but a lack of trying.
Brittney: "What is an Intelligence Quotient?"
Teacher: "You mean an IQ, the thing we have been discussing for the last 10 minutes."
Friend of Brittney: "Seems like your lacking number 4."
by Andres Gonzalez February 07, 2008

Words related to Lacking number 4

brittney crazy dumb god weird