"Thnks fr th Mmrs" (pronounced "thanks for the memories") is the third 2007 single released by the Chicago band Fall Out Boy. It is featured on their 2007 release Infinity on High. The song, according to bassist Pete Wentz in an interview with Kerrang!, refers to a romantic relationship in which the initial sentiments have perished, but both lovers continue to "sleep with each other" to appease their physical and mental desires. The title, "Thnks fr th Mmrs" is the words "thanks for the memories" after having been disemvowelled, much like it would be written as part of a text message. Another reason for the song title's lack of vowels comes as joking nod at Fall Out Boy's record company, who have asked them to shorten their often verbose song titles.

The song features Kenneth "Babyface" Edmonds on mandolin and The Movement Orchestra Strings, and was featured as the theme song on an episode of VH1's Best Week Ever. The chorus of the song contains the line, "He tastes like you, but sweeter", a line referencing the 2004 film Closer.

"Thnks fr th Mmrs" was also featured in the Doctor Who Confidential episode "Do You Remember the First Time?", put to a clip showing scenes from the 1963 series through to the 2007 series. Selective clips have also been used by Network 10 in Australia to promote the Australian Rules Final Series in 2007 and was #8 on the Video Hits Top 100 Countdown on the same network.

A maxi single with six alternate mixes and edits of the song was also released as a digital download.