'Hooked' - Season 5, Episode 16
The gang tries to convince Ted he's being strung along by Tiffany, so they discuss past relationships where they've been in the same situation.
Air Date: March 1st 2010.
Robin: She's stringing you along, but she's not committing to you, but she's keeping you around just in case, like an old can of chilli in the pantry.
Lily: Um, who's buying chilli and not eating it right away?
Marshall: Amen to that, sista! (They high five)