subliminal disrespect towards another person.Saying something about somebody without saying it to them.
"I see yo punk ass low key sneak dissin me!".One rapper who sneak disses alot is Jay Z. On one track of Blueprint 3 he refers to Dame Dash by saying "Hey lucky lefty!Kiss the wife goodnight for me!(laugh)" referring to dame dash's divorce.
Someone who's talking trash behind someone elses back.
"I heard he be sneak dissin about you G!"