gecko:  guy 1:wow, dude gecko here just jumped over my suv, damm  guy 2: dude now hes running up the fire escape, look at him go
a person who is extremely good at scaling urban buildings, or natural rock formations
"gecko:  guy 1:wow, dude gecko here just jumped over my suv, damm  guy 2: dude now hes running up the fire escape, look at him go" What is the definition of "gecko"?