In Colombia it means slow, lerdo, clumsy. It takes a long time to think or understand. Also in political slang is the person who accepts office, in a ruling government contrary to its principles.
lentejo is incorrectly written and should be written as "Slow and pendejo" being its meaning: Slow and pendejo
LENTEJO: Politician who accepts posts of the Government of the opposite party, ignoring the instructions of the party itself.
Slow person, without wanting to, loose to run activity Dynamics jobs