sondies is the term for 'fingering'.

may also be used as 'giving arse/ass sondies'

term derives from the horrible sweaty damp smell you get wearing old Sondico goalkeeper gloves in football
"Did u give her some sondies?"

"I saw this lad giving sondies in the cubicle"

"I saw Andy giving arse sondies"
by belterchild December 9, 2009
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