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1.
when a person doesnt want to spend money and tries to take scraps from your plate or get free drinks
There goes Dan again, alley-catting off my leftover appetizer sampler
by theDALLAScrew October 31, 2011
 
2.
alleycatting,

Is a popular term for a type of urban car-less dogging, traditionally found in northern towns. Outdoor public sex in the alleys between back to back houses, while being observed by voyeurs and for the titilation of curtain twitchers..

Alleycatters is the name for the people who partake in this fetish
I drank six pints and then went out and did some alleycatting, last night..
by maleyprops April 11, 2013