Cojer just means "get" in a number of Hispanic countries; it's mostly Mexicans who say "I'm gonna get that girl" to refer to fucking.
In Puerto Rico, where "cojer" just means "get" ("fuck" is "joder") the expression "Cojelo suave!" ("get it smooth!", literally) just means "take it easy!"
I once said "cojelo suave!" to a Mexican, though, and he replied "Voy a cojerlas todas suave!", meaning "I'm gonna fuck 'em all (the girls) smoothly!" He knew what I meant, but made a neat joke out of it.
Means to have sex in spanish; Fuck
I want to cojer that chicka