From WordNet (r) 2.0 (August 2003) [wn]:
high-tail
v : retreat at full speed; "The actress haigh-tailed to her
villa when reporters began to follow her to the
restaurant"
From WordNet (r) 2.0 (August 2003) [wn]:
hightail
v : leave as fast as possible; "We hightailed it when we saw the
police walking in"