It's when a chick stands over you and pisses in your mouth then sticks a tiny straw in your salt-rimmed mouth and drinks it all before saying "Jamaican me crazy!"
Yo this girl gave me a salty jamaican Juicebox last night... think I met my wife
Liquid diariah caused by eating really spicey or greasy Mexican food, gives the victim stomach cramps and the urgent need to find a toilet before their asshole explodes.
After eating at a Mexican restaraunt Bill had to hurry home because he felt a Tiajuana juicebox coming on and he didn't want to shit his pants.
Brought to international recognition by the endeavors of Harvey Birdman (Attorney-At-Law), the phrase is used dismissively to interrupt a drawn-out answer to a question the speaker makes one wish they had never asked in the first place.
Harvey: Tell me, does Race have any... new buddies?
Johnny Quest: I DID see him talking to Doctor Zin the other day...
Hadji: Oh! Dr Zin is doctor quest's arch enemy! AndanyenemyofDoctorQuestisanenemyofminebecauseioweDoctorQuestverymuchbigtime.