1
general::
Phrase(s): be too [and] be so
to be something (despite any information to the contrary). (An emphatic form of is, am, are, was, were.) • Mother: Billy, you aren’t old enough to be up this late. Billy: I am too! • I was so! I was there exactly when I said I would be!
McGrawhill's American Idioms And Phrasal Verbs