As fast as possible:I took off lickety-split across the lawn...
Before you go from 5K runner to marathoner lickety-split, you'll have to address the second tenet of neuromuscular training: teaching your mind to push through pain, because - we won't lie to you - there's a lot of it.
And yet he's had a very sunny disposition, telling great stories about how everybody is moving through lickety-split.
The man should be lauded for wanting to get places lickety-split.
Origin
Early 19th century (in the phrase as fast as lickety 'at full speed'): from a fanciful extension of lick + split (verb).