Neck is a slang term used for fellatios, head, oral sex etc. For instance if someone is asking for a blowjob, they will instead say 'Give me some neck'. This slang is mostly used to refer to a woman giving oral sex to a man, however, it can also be used for a man giving oral sex to a woman. This slang is heavily used in hip hop songs, in L'A Capone's 'RondoNumbaNine." class="wiki wiki_page">Facedown' song, he said "She give me her check, she give me her neck", L'A is basically saying not only does her girl give him money, but she also give him oral sex.