If you get goose bumps, the hairs on your skin stand up so that it is covered with tiny bumps. You get goose bumps when you are cold, frightened, or excited.
goose bumps in British English
(ɡuːs bʌmps)
plural noun
another name for gooseflesh
goose bumps in American English
US
a roughened condition of the skin in which the papillae are erected, caused by cold, fear, etc.