A mild or almost undetectable sensory exchange between two people who may or may not be sexually appealing to one another. This can manifest in the form of thighs touching gently while seated next to one another, brief but intense eye contact, or one person leaning over the other to see something.
"We were sitting on the bus together, and there was definitely some subtle touching there."

"See the way he's leaning over her? That's a subtle touch."
by subtle touching September 8, 2014
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