The act of reintroducing healthy foods to teenagers. Foods they would have been weaned on as a baby/toddler
Mother: I've just made our teenager eat cabbage.
Father: Ah, you mean we're going through the tweaning stage
Father: Ah, you mean we're going through the tweaning stage
by Lady Ellester June 22, 2011
Get the Tweaningmug. 
Yo, that person is fucking twean.
by Jackle01 January 3, 2017
Get the Tweanmug.