So... what's up with Hollow "Giant Woo"?

Pretty much what Shadiel said there, here's the full spellcard description: "No. 200: 虚人「ウー」
Hollow Giant "Woo"

(虚人 refers to an immortal being called "Wu" (Chinese reading of 无: nothing) that is depicted in a manga; '3x3 Eyes' by Yuzo Takada. The car-running over part is how Yakumo, the protagonist, nearly dies before being turned into a Wu.)

Owner: Fujiwara no Mokou
Extra — Extra
Comment: うー。余り美しくない不死鳥。車に轢かれてぐちゃぐちゃ。
この攻撃は地面に手を付けてトウチャっ！って感じ（ふざけ過ぎ）

Woo. A not-so-beautiful phoenix. It got run over by a car, and splat.

This attack is something like putting her hand to the ground, and Touchah! (joking too much)

(It's a reference to 'Tou Zaau' (Cantonese reading of 土爪); a spirit that is depicted in the manga. Tou Zaau looks something like a crab that splits the ground apart when its summoner puts his hand to the ground and summons it.)"

I find it interesting to've figured this too.. Also here's the page in case you're curious about the other names: touhou.wikia.com/wiki/Imperishable_Night:_Extra_Spell_Cards

(Assuming Border Team)
Deploy Ran on Mokou and head left. Wait for her to come to you, and after she fires the purple familiar set, quickly slip through the red bullet wall. After the area begins to get crowded, head back to the left side and dodge stray bullets. Rinse and repeat.

This does take a bit of practice, though.