a person or thing that lies so much, that you can't tell when they're telling the truth anymore. if someone or something is a lima bean, they don't wear pants for every time they do, the pants catch fire due to all the lies.
Geez, Michelle was telling me a story last night & you could tell it was al bullshit.. she's such a lima bean!
When a girl takes her used condom, empties it out and freezes the skizz, and then discreetly puts it in her man's ice cream the next day. A technique for emasculating and humiliating a heterosexual man by providing undeniable proof that he has swallowed semen, albeit unknowingly.
Watch out dude, I heard she slipped her last boyfriend a lima bean!