sellotape is a long sticky strip of material that you use to to attach things together such as paper, the end of your apple charger to make it not bend, and the mouths of your hostages. it is an extremely dangerous material, and it is not allowed to be used in most institutions. if they find out you've been using it they will stamp down on you, and they will punish you to ensure that the people don't gain any kind of power, as they want to keep you in your place so that they can keep theirs at the top. they want to stamp down on our freedom of creative expression, because they know, essentially, that we will expose them.
A road side memorial, usually in the form of a wreath or bunch of flowers Sellotaped to a lamp post or road sign to mark to place of a traffic accident in which fatalities occurred.
An amalgamation of the words 'Sellotape' and 'Cenotaph'. (Sellotape is a popular European brand name for sticky backed plastic tape, aka Scotch Tape.)
Maud - "Oh look Bernard, there's one of those Sellotaphs." (pointing at the flowers taped to a post on the side of the road)
Bernard - "Must have been an accident here." (looking at said flowers, taped to a post)
Maud - "Oh yes... In that case stop looking at the Sellotaph and keep your eyes on the road!" (Maud hits Bernard with hand bag)