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Not really a glitch more a trick to give you extra time when the opponent wants to defuse the bomb so it works in Demolition, sabotage and SnD
What you need before you plant is a care package either the normal care package or the sentry gun.
You plant the bomb on a open location (no roof) after planting it take out your care package and throw it on top of the bomb. Then just start defending it.
I got my heads up this way really easy playing sabotage.
If you throw the carepackage correctly (which isn't that hard) they will have to take your care package first before they can start defusing the bomb. Obviously in some cases this will be the difference between a win and a loss. Also its a lot of fun to win a match while your entire team is death with 10 sec on the clock but they can't defuse in time.

^