僕 は 男 だ — Tae Kim's Japanese Grammar flashcard

As for me, [I'm] a guy. otoko: man; male "ha" (always spelled in Hiragana: は) is the "topic particle" and is always pronounced "wa". It's attached to a noun and identifies it as the topic of what you're talking about or as topic of the sentence. It's very important to keep in mind that "boku ha..." is most certainly omitted, if the topic is clear from context.