The drug methamphetamine hydrochloride (crystal meth)
"The police seized a bag of white powder that they suspected was tina, a dangerous form of crystal meth often sold to addicts."
In plain English: Tina is usually just a girl's name, but as a noun it can mean an old-fashioned tin container for holding food or other things.
"Tina is my best friend who always helps me with homework."
A female given name from Ancient Greek.
"The teacher introduced Tina, explaining that her name is a popular variation of Tina derived from the Ancient Greek word for maiden."
Initialism of there is no alternative. (a political slogan of Margaret Thatcher)
"The prime minister famously declared that her economic policy was tina, insisting there was no other viable option for the country's recovery."
Tina is a shortened version of names like Christina or Martina that end in the suffix -tina. This suffix originally comes from Latin and was commonly added to create feminine forms of male names.