sally out is a verb meaning "set out in a sudden, energetic or violent manner". It carries 2 recorded senses.
set out in a sudden, energetic or violent manner
jump out from a hiding place and surprise (someone)
“The attackers leapt out from the bushes”
Definitions, synonyms and semantic relations for sally out come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.