twit

Concise Oxford English Dictionary © 2008 Oxford University Press:
twit1

▶noun informal, chiefly Brit. a silly or foolish person.

– derivatives
twittish adjective.

– origin 1930s (orig. dial., in the sense ‘tale-bearer’): perh. from twit2.

Concise Oxford English Dictionary © 2008 Oxford University Press:
twit2

▶verb (twits, twitting, twitted) informal tease, especially good-humouredly.

– origin OE ætwītan ‘reproach with’, from æt ‘at’ + wītan ‘to blame’.