It all went down at a fancy party inside a nail salon in Manhattan ... when Erica Mena got into a heated discussion with a blonde lady named Tiffany. Multiple people who were at the party tell us the two were squabbling over a man ... and Tiffany implied that she had hooked up with Erica's BF in the past. We're told Erica DECKED Tiffany ... and all hell broke loose. People rushed in to break up the girls ... but both women made it clear -- THEY WANTED TO FIGHT. At one point, a man steps in to restrain Erica ... and she threatens to slap him in the face unless he got out of her way. She even gives the dude a pretty nasty forearm to the body.One clear moment, though we don't know the "context," is when we see Erica Mena saying, "F-ck all of y'all," loudly four times before adding, "Love & Hip Hop can suck my d-ck!" to someone or a group of people off camera. We're pretty sure Mena doesn't have a peen, so she certainly was very, very mad. Rich Dollaz is also seen looking generally irate at the clips end, for some reason. The incident went down the night of February 12 since that's when Mena promptly took to Twitter to talk more ish. "They Eat It! Then want bragging Rights! Yeah I knocked @Tiffsway The Fawk Out Tonight SOO Classic!," she tweeted. Tiffany, Mena's opponent, couldn't let that slide, with one of her tweeted responses being, "@Erica_Mena What's ur zip code?? Oh u have none..:( Where u rest ur head is ur home!! at least for that night." Damn. In more positive Love & Hip Hop news, Yandy Smith issued a statement regarding Mendeecees Harris' legal issues and revealed she is launching a mentoring program for young girls in the spring.But just when she thinks she's safe, Erica is BLINDSIDED by Tiffany ... who somehow crept up from the side, and pounced on her prey like a ferocious ocelot (look it up, they're awesome).