boyism

Noun

 * 1)  boyhood
 * 2)  The nature of a boy; childishness.
 * 3) * a. 1700,, Preface to Poems on Various Occasions
 * He had complain'd he was farther off from Possession, by being so near, and a thousand such Boyisms, which Chaucer rejected as below the Dignity of the Subject