“Sticking punks up is the perfect hustle for a new kid in town. Marks ain't gonna recognize you, won't be able to come back. Take advantage of that low profile at a meet under the Del Perro pier. l don't care what happens to the Lost and Vagos dudes involved, long as the product finds its way to my spot. Oh yeah, there will be some change in it for you.”
The Lost and the Vagos are having a drug meeting under the pier in Del Perro. A package of meth is what Gerald is interested and the team needs to head to the meeting and get the stuff. After all the Vagos and Lost involved in the meeting are killed, the player possessing the stuff needs to simply get it to Gerald's apartment.
Steal the meth.
Deliver the meth to Gerald's apartment.
GTA Online - Mission - Pier Pressure Hard Difficulty
The mission's name is a play on the term "peer pressure".