adj. May cause an owie.
Real citation: "I'm keen on seeing Baby Face Nelson, the one Siegel I've never lucked across, and even keener to re-see the seldom-shown, collision-y procedural The Lineup, which features a hit man and his dapper assistant, who writes down the victim's last words into a keepsake notebook."
(James Wolcott, "The Siegel Catalog," March 19, 2006, http://jameswolcott.com/archives/2006/03/the_siegel_cata.php)
Made-up citation: "My dad is the ultimate sports nut: if there are balls and collision-y behavior involved, he will watch."