Bandwagon - should probably specify that it's a stream of votes (i.e. usually one after the other)
LYLO - stands for Lynch or Lose. A situation wherein the non-mafia only outnumber the mafia by 1. So, if the town choose to No Lynch, the mafia kill the next night will cause the town to lose. A LYLO situation is also inherently a MYLO situation, and is arguably the worst position a town can find themselves in.
Mafia - could possibly reference that a single mafia member is sometimes referred to as a mafioso
MYLO - stands for Mislynch and Lose. A situation wherein the non-mafia only outnumber the mafia by 2. So, if the town lynch a non-mafia, the mafia kill the next night will cause the town to lose.
OMGUS - stands for Oh My God You Suck. A situation wherein Person A votes for Person B with sound reasoning, and Person B responds with no reasoning, or their reasoning being "You voted for me so you are scummy". Usually, Person B is inexperienced and cannot grasp the concept that while they know they are clear to themselves, they are not confirmed to anyone else. Named after a 'typical response' from B.
QT - could link to QuickTopic.com
Town - could possibly reference that a single town member is sometimes referred to as a townie
WIFOM - stands for Wine In Front Of Me. A bluff/double-bluff argument which cannot resolve. The core idea of WIFOM is judging the actions of one person when that person knows what others expect them to do. It usually starts when something is viewed as being "too obvious". For a more in-depth definition and examples, check http://wiki.mafiascum.net/index.php?title=WIFOM