have (one's) back up

(redirected from had my back up)

have (one's) back up

To become or cause to become angry, hostile, defensive, or irritable. John had his back up when his parents brought up the subject of college. My dad always has his back up during election season.
See also: back, have, up

have (one's) back up

To be angry or irritated.
See also: back, have, up