The episode is called Roger 'n' Me and is from the first season.
In the American Dad episode, "Roger 'n' Me", both Roger and Stan were drunk. Roger said to Stan that there is a "procedure" that can be done for them to get to know each other (memory sharing). Roger gave Stan an anal probe in the jacuzzi (Roger is an alien, the probe was the procedure.
In the episode "A.T. The Abusive Terrestrial", Roger feels neglected by Steve and sings a song about his feelings of neglect. During this song, it shows different points in Steve and Roger's relationship, one of them being Steve getting Roger for his tenth birthday as a gift from Stan.
I'm pretty sure it was Stan's Night Out
The Worst Stan
Bullocks to Stan
In the American Dad episode, "Roger 'n' Me", both Roger and Stan were drunk. Roger said to Stan that there is a "procedure" that can be done for them to get to know each other (memory sharing). Roger gave Stan an anal probe in the jacuzzi (Roger is an alien, the probe was the procedure.
Season Six's You Debt Your Life shows in flashback how Stan met Roger.
In the episode "A.T. The Abusive Terrestrial", Roger feels neglected by Steve and sings a song about his feelings of neglect. During this song, it shows different points in Steve and Roger's relationship, one of them being Steve getting Roger for his tenth birthday as a gift from Stan.
the song is called don't stop me now by queen
I'm pretty sure it was Stan's Night Out
The Worst Stan
Bullocks to Stan
season 4 episode 64, where he dates his daughter.
Son of Stan | Season 6 | Episode 2
She Did. In the Episode where Stan Visits his Native American half-brother.
She voices a stripper in Stan Knows Best
In Country Club