'Shenanigans' is a noun referring to secret or dishonest activity. "Their shenanigans are going to get you into trouble someday." It can also refer to high spirited behaviour or mischievous play, especially by children. "They're playing together outside getting up to all sorts of shenanigans." 'Shenanigans' can also refer to both good or mean spirited trickery or mischief. "His character was full of shenanigans, playing tricks and getting up to mischief."