While playing Mario Kart, you get shafted so bad and so many times, that you go from first to last and can't win the race.
Common symptoms of being Tom'd are: Losing horribly, throwing controllers, screaming at t.v., loss of respect, ridicule from friends, not wanting to play Mario Kart, and having to leave the house because its late and people need their sleep.
Jesse: No, no no no! Fu-fuck!! I just got shafted!!
Neil: No Jesse, you just got Tom'd.
Jessie: *throws controller* I'm done with this.
To totally destroy someone in a fight even though they brought their "friends" to help out.
To go about your business of kickin' ass and takin' names without even caring.
Guy 1: Holy crap! Did you just see that fight?!
Guy 2: Yeah man, that one dude was swingin' dick heavy! He totally messed that douche-bag up!
Guy 1: Oh shit, I think I found part of his ear...
Inmate 1: What're you in for?
Inmate 2: Oh you know, I got caught swingin' dick heavy on some guy.
Inmate 1: Don't lie to me. If you were really swingin' dick heavy, you would've destroyed the cops too.