Heikki is the term used for someone who likes being the core of information, but doesn't let anyone know of this knowledge, storing it for later use when the opportunity rises to use it as a weapon or in a defensive way.
"in an arguement"
A: Let me tell you what i think of you bastard!
b: Be carefull now, i like to Heikki and have allready heared what you think of me, as do i know what everyone else thinks about you and say behind your back, as do i know what you tell behind everyone elses back. Stfu or i'll spill and you'll have lost friends and gained enemies. And stop talking about people's backs in the future, because you know i'll hear it sooner or later. F******* hypocrit