From The Collaborative International Dictionary of English v.0.48:
Catchy \Catch"y\, a.
1. Apt or tending to catch the fancy or attention; catching;
taking; as, catchy music.
[Webster 1913 Suppl.]
2. Tending to catch or insnare; entangling; -- usually used
fig.; as, a catchy question.
[Webster 1913 Suppl.]
3. Consisting of, or occuring in, disconnected parts or
snatches; changeable; as, a catchy wind.
[Webster 1913 Suppl.]
It [the fox's scent] is . . . flighty or catchy, if
variable. --Encyc. of
Sport.
[Webster 1913 Suppl.]