Rear Upper Control Arm - used to control camber and caster when lowering your car.
damn, that guy should get aftermarket RUCA's for that 240sx
by qwarnon October 27, 2009
A homegirl or girlfriend.
A woman who is considered to be old.
"Call my ruca on the phone, let her know I'm home alone."

Damn, my grandma just turned 75. Ya esta bien ruca.
by Dub44018 November 03, 2005
a pretty girl that has respect for her body.. for her culture... her life... for being her.
every latina is a ruca... in her own way
by lushuzma August 16, 2005
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