Leo's mispronunciation of the film title Philomena during the Golden Globes ceremony has catapulted the film into the limelight.
The Wolf of Wall Street actor made the gaffe as he read out nominations for lead actress in a drama at the star-studded awards, pronouncing the drama's title as 'Philomania'.
Philomena tells the true story of Irish woman Philomena Lee's search for the son she was forced to give up for adoption by nuns in Roscrea.
Film promoters have seized upon DiCaprio's rare slip of the tongue and it has now sparked a global Twitter trend.
And the Weinstein Company, known for their vigorous and unique marketing techniques, is using the slip-up as a way of promoting the film with the hashtag #philomania.
The real-life Philomena Lee (80), on whose life the acclaimed Oscar-nominated film was based, attended Sunday night's Golden Globes ceremony, along with funnyman Coogan, and is said to be enjoying the awards season in Los Angeles.