Matt Stafford's wife, Kelly, is sharing her side of "Pretzelgate" ... saying she "f***ing lost it" during the incident and will be taking a break from going to Rams away games.
TMZ Sports broke the story ... Kelly apologized last week for tossing a soft pretzel at a heckler during the Rams' road game against the San Francisco 49ers, which resulted in her being escorted out of the stadium just 5 minutes into the game.
Stafford had remained radio silent about the altercation -- aside from an Instagram comment -- until she addressed it on her "The Morning After" podcast Tuesday, when she admitted she lost her cool.