UPDATE: Johnny Manziel calls Longhorn tattoo 'fake' and angrily responds to critics via Twitter

Heisman Trophy winner Johnny Manziel appears to be enjoying spring break in Cabo San Lucas. (BustedCoverage.com)

Johnny Manziel went to Twitter to describe the Longhorn tattoo on his stomach as a "fake." He also got into a Twitter war with several critics about the subject.

How will Johnny Manziel's legendary status on the Texas A&M campus -- at least during football activities, if not classes -- withstand a shirtless spring break photo that's gone viral?

The quarterback who became the first freshman to win the Heisman Trophy while leading the Aggies to an impressive SEC debut that included a road upset of No. 1 Alabama, may have some explaining to do. A photo depicts Johnny Football enjoying his spring break in Cabo San Lucas while wearing a Texas Longhorns tattoo revealed on his rib cage below his left pec.

If the photo and tattoo are legit, Manziel will likely catch some flak from Aggies who love to hate their intrastate rivals and former Big 12 partners. After all, the lyrics of Texas A&M's fight song specifically mention the Longhorns:

Hullabaloo, Caneck! Caneck!

Hullabaloo, Caneck! Caneck!

Good-bye to Texas University

So long to the Orange and the White...

The eyes of Texas are upon you...

That is the song they sing so well

So good-bye to Texas University...

Manziel's Texas A&M media guide bio makes mention of his former infatuation with the Longhorns, before he wound up playing quarterback in College Station:

Manziel, whom A&M coach Kevin Sumlin hasn’t yet made available for interviews this season, grew up a Texas Longhorns fan (he often sported UT gear around Tyler), but Texas didn’t heavily recruit him. In fact Florida coach Will Muschamp told his players during halftime of this year’s A&M game that UT, where Muschamp had previously served as defensive coordinator, only wanted Manziel as a defensive back.