It really depends on the mood.
Spice Girls' Wannabe when hanging out with the chicks.
We Are The Champions for motivation and karaoke.
More recent ones would be Peking Duk's High, Clean Bandit's Rather Be and anything by Disclosure.
Tough question. Some favourites are Stand Inside Your Love by The Smashing Pumpkins, Mother Earth by Within Temptation, but I gotta add some 80s studd too like Neutron Dance by The Pointer Sisters, Stir It Up by Patti LaBelle, Under Pressure by David Bowie/Queen. So many great songs though.