|How I Met Your Mother episode|
|Episode no.||Season 4
|Directed by||Pamela Fryman|
|Written by||Craig Thomas, Carter Bays|
|Original air date||November 17, 2008|
Robin begins to tire of how Marshall is always around when she is spending time with Lily. Lily invites her to her friend Jillian's birthday party. They arrive at the party and are surprised to see it is being held in a western-style bar; they discover Jillian is a "Woo girl", a single woman who often goes out partying, nicknamed so because of their supposed tendency to constantly yell out "woo!"
After the party, Lily is surprised to discover Robin has become a "Woo girl", and is spending time hanging out with Jillian and her friends. Lily tries to spend time with Robin and her new friends, but does not fit in. Robin explains that this is because woo girls are sad people, with little to look forward to in life, whereas Lily is content and married. Robin explains she feels like one of these people, as she is both unemployed and single. The two resolve to spend some more time with each other without Marshall.
Meanwhile, Ted hears from Barney that Goliath National Bank are looking for an architect to design a renovation for their main building. Ted pitches against Sven, a Swedish company which he hates. Although Bilson is close to hiring Ted, Barney convinces him to go with Sven, as their design idea was to make a dinosaur-shaped building that breathes fire. Barney later feels guilty about betraying his friend and makes Bilson hire Ted instead.
Donna Bowman of the The A.V. Club gave the episode an A-, complaining about the unnecessary computer-generated effects (used for the T-Rex building and the pigeons on the rooftop), but praising the "crackerjack comic timing" and "solid script structure".