This phrase is another way of saying, "to have sex."

Also, "to fornicate in a grassy field."

To roll in the clover implies that a man and his smitten lover have been having intercourse in a field of some sort.

Sometimes, this can be equated to recieving field head.

Some people insist that this is what happened in a deleted scene in a star wars movie.

Noun: a friend who is usually only called upon by a friend when a more primary/prominent friend is unavailable.

Taken from the term “second string” in an athletic competition situation. In football, if the star quarterback gets injured during a play, the second string is called off the bench to replace him/her. A “Second String Friend” is essentially benched until needed, if ever.

Synonyms: Plan B, Second Choice, Secondary Friend, Benched Until Needed