competition: How do you say I beat you in your language?

There is the straight forward "Natalo kita!" but that's boring. ;-)
The cool version is "Olats, pare!!" Pretty much saying, "Loser!"
"Olats" (o-lats) in reverse is "talo" which means to lose. "Pare" (pa-re) is a short version of "kumpare" or "kumpadre" which means "buddy" or "pal" or in this usage, "dude".
So it's like saying, "You're a loser, dude!" or simply "LEEOOOOWSSSEERRRRR!"