A straw purchase is buying a gun for someone who is not you.
4473 Question 11A:
a. Are you the actual transferee/buyer of the firearm(s) listed on this form? Warning: You are not the actual transferee/buyer if you are acquiring the firearm(s) on behalf of another person. If you are not the actual transferee/buyer, the licensee cannot transfer the firearm(s) to you.Exception:If you are picking up a repaired firearm(s)for another person, you are not required to answer 11.a. and may proceed to question 11.b. (See Instructions for Question 11.a.)
the way this is worded is scary because it can so easily be expanded to impose so many more restrictions on gun owners.