Back in the 90's

Back in the 90's is the ending credit's theme for BoJack Horseman. It is performed by the band Grouplove.

The song is based on BoJack's life after his star role on the 90's sitcom Horsin' Around.

Lyrics

Back in the 90's

I was in a very famous TV show

I'm BoJack the Horse (BoJack)

BoJack the Horse

Don't act like you don't know

And I'm trying to hold on to my past

It's been so long

I don't think I'm gonna last

I guess I'll just try

And make you understand

That I'm more horse than a man

Or I'm more man than a horse

BoJack!

In some episodes an alternate version of the ending theme is played, usually with the lyrics changed to reference that specific episode.

In The BoJack Horseman Show, the opening line of the song is changed to "Back in '07, I was in a not-successful TV show," with the rest of the lyrics referencing the short-lived TV show that the episode focused on.
In See Mr. Peanutbutter Run, the song at first appears to be unchanged but turns out to be about Mr. Peanutbutter (who was also in a famous TV show in the '90s), and his campaign for governor.
In The Dog Days Are Over, the end credits feature a Vietnamese cover of the song by Thao Nguyen.
In The Amelia Earhart Story, the song is replaced with an instrumental acoustic guitar cover performed by Alex Heflin.
In Free Churro, an instrumental organ cover is played.
In Ancient History, the usual version of the song is replaced by a hard-rock cover performed by SlutBomb. (The lyrics, however, remain unchanged.)
In Mr. Peanutbutter's Boos, an instrumental Halloween version of the song is played.
In The New Client, it is played as an instrumental lullaby.

In some episodes, Netflix's subtitles will mistakenly transcribe the lyrics as "BoJack the Horseman" instead of simply "BoJack the Horse."
The song is heard for the last time in The Horny Unicorn:
- This is due to BoJack selling his loyalty rights on Horsin' Around in the following episode, Angela.