"Blah Blah Blah" was written by Ke$ha alongside Neon Hitch, Sean Foreman and Benny Blanco who also produced the song. Ke$ha said that the song originated from a discussion they had in the studio on the politics of female-male relationships which Ke$ha later explained, "The song came about when the people that wrote it — me, Benny Blanco, Neon Hitch and Sean Foreman — all got in a room, and they were talking about how chicks talk too much, and me and Neon were like, 'No, no, no, guys talk too much. So, we had this war of who were more obnoxious, chicks or dudes. And the song kind of came around from that conversation. I think I make a pretty fair point both in this video and in the song, that dudes are way more annoying."
The music video for the song was directed by Brendan Malloy. It premiered on February 23, 2010. Both members of 3OH!3 make an appearance in the video. Ke$ha told MTV that the video primarily involves men (described as "douche-y") hitting on Ke$ha, while she declines their advances. "At one point," Ke$ha says "I get to be strapped to this harness and bouncing around everywhere, and it was really cool [...] The whole concept of the video was a bunch of douche-y guys macking on me as usual, and me making them eat their toupees or other various items". Melanie Bertoldi of Billboard said that the clip was "thoroughly entertaining". Bill Lamb of About.com noted that the video "well may be her "Poker Face" moment that identifies Ke$ha as a seriously creative pop force to be reckoned with." Lamb commented on the appearance of 3OH!3 stating, "they have a cameo role in the video, but it really is all Ke$ha", "there is little doubt she has serious star power." In the first scene, outside of a club, Ke$ha is hit on by comedian Bret Ernst. He tries to convince Ke$ha that they would make a good couple, meanwhile Ke$ha texts someone, describing the man as a "major douchemaster". The next scene has Ke$ha at a bar playing pool near a man, where she duct-tapes him, later pulling down his pants, after describing him as a "tool bag" in a text message. In an arcade, Ke$ha pushes a man away who is making conversation with her. The third suitor attempts to serenade Ke$ha with a guitar, to which Ke$ha replies by stuffing paper in his mouth. In the final sequence, a man tries to talk to Ke$ha in a bowling alley. She loses interest when his toupée falls off his head and she shoves the hairpiece into his mouth, in vein of the previous arcade scene. The video ends with Ke$ha and 3OH!3 singing and dancing together in the bowling lanes.