Jack Hammer went to college with Peter Parker, but was considered a huge nerd even by his standards. It wasn't until a time traveling Deadpool (pretending to be Peter Parker) took him on a drinking binge that he really began to loosen up and... basically ruined his life, going from a A+ student to a high-tech loser. At some point, he became a weapons dealer and tech-guy for Deadpool.
More recently, he's been seen acting as an armored security force in Las Vegas going by the name "The House". After battling Deadpool, who was making money in a casino, the Merc offered Weasel the chance to work with him as his assistant Wildcard. During a battle with Grizzly, Wildcard made House look useless, so the next time Deadpool proposed Weasel to change identities. During a second fight with Grizzly, Weasel made Wildcard look like the hero of the fight, while Deadpool blacken the name of House and Weasel escaping with Grizzly and stolen money. Being considered a criminal, Weasel tried to defeat Deadpool/House in battle, but the Merc escaped before Weasel exploded his suit helmet. When Wildcard bosses tried to find a body inside the armor there was nothing, so Weasel couldn't clean his name and remained as a fugitive, while Deadpool resumed the identity of Wildcard (although he renounced short after).