As Tumblr user freekicks put it, “If we told the 1D shippers that a man named jimmy hoffa had proof larry stylinson was real, they’d have his body found and dug up in 45 minutes, tops.” ...

Larry, for those of you outside of the 1D fandom loop, is the nickname given by people who "ship" (i.e. fantasize about a relationship between) Harry and Louis.