Means the same thing as "harden the fuck up" but the speaker is not yet hard enough to bust out a four letter word.
by febikes September 2, 2012
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Harden the flipp up • harden the fuck up • the water that hardens the egg softens the potato • the hayden • Doin the Hayden • the harder you go, the louder it gets • Absence makes the dick grow harder • I am varter the farter, who raped jimmy carter, who asked for it harder • harden • Harden My Heart