DCHP-1 Online
hellery [< heller mischief-maker] Slang 
n. mischief; trouble; wild behavior.
- 1910 (1921) "He's got me guessin'; some hell'ry on [that] we ain't doped out yet."
- 1930 We don't have to bother what hellery they'll be into next till we get back home.
- 1965 For years . . . I have been craftily awaiting the chance to write a column about women's brassieres, just for the (wink! wink!) hellery of it.
- 1910 (1921) "He's got me guessin'; some hell'ry on [that] we ain't doped out yet."