cracker

1 chiefly dialectal :  a bragging liar :  boaster

2 :  something that makes a cracking or snapping noise: such asa :  firecrackerb :  the snapping end of a whiplash :  snapperc :  a paper holder for a party favor that pops when the ends are pulled sharply

3 crackers plural :  nutcracker

4 :  a dry thin crispy baked bread product that may be leavened or unleavened

5a offensive —used as an insulting and contemptuous term for a poor, white, usually Southern personb sometimes offensive :  a native or resident of Florida or Georgia —used as a nickname

6 :  the equipment in which cracking (as of petroleum) is carried out

7 :  hacker 4