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50 Cent couldn't help but gush over Taylor Swift mentioning him on her song "Ruin The Friendship" from her blockbuster "The Life of a Showgirl" album ... and sent a backhanded shot to Travis Kelce 's ex-GF!!!

During his sit-down with "Extra," 50 Cent dissected his shout-out on the track, basking in the fact that Taylor was using him as a ubiquitous reference for what was lit in pop culture at the time her song reflects upon. Gallery Launch Gallery

50 admitted the All-Pro tight end made him a Chiefs fan before quipping he preferred seeing Taylor and Travis together ... as opposed to that "last thing" he was with. Gallery Launch Gallery Getty

Of course, that last thing is Kayla Nicole , who dated Travis for five years before he got engaged to his meg

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