Trina just learned a valuable lesson ... leave your weed at home when traveling on an airplane.
According to court documents, the "Here We Go" rapper just plead "no contest" in Broward County court for possession of marijuana less than 20 grams.
The charge stems from Trina's arrest back in March when her carry-on bag was searched at Fort-Lauderdale-Hollywood International Airport and officials found 12 grams of pot hidden inside a white sock.
Also turns out "Trina" is just an alias ... her real name is Katrina Taylor.
According to the docs, 42-year-old Trina was given a slap on the wrist, a $293 fine.