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1.
Verb. The act of shielding a boner. Most commonly used with textbooks or large binders by teenage boys.
Look how low jason is holding his book. Hes totally shielding.
by Lady Gagas Clit September 22, 2011
 
2.
Rejecting the fact that he/she is a complete closet homosexual, and he/she is fooling no one by denying is.
You know that Andrew guy? he is totally shielding.
by 339201169 March 26, 2009