great folksy word

it means 'talk/reason too much', 'talk superfluously'

давай, не рассусОливай!- с'mon, don't talk too much (do your job or hurry up)

originates from сус(о)лить, an obsolete synonym of сосать/обсасывать - suck (on)

ground squirrel is called сУслик, probably due to their typical gesture as if they suck on something



__________________

а rude equivalent of рассусоливать is жевать сопли - chew on the snot