Alright,
Well In-Game Alot of People Have been Asking How to Do this. Im Sure almost Everyone Knows how to Do this. But ill Share it Anyway

First of All, When Your in a Search&estroy or Sabotage Game Make Sure you Have the Bomb. And Make Sure you Have Bouncing Betty's on The Desired Class That Your Gonna Play with..
You must login or register to view this content.

Then, Walk up With Your Betty's Equipted , Plant them Both Right on The Bomb,
So that immediently After You Plant the Betty's You can Plant the Bomb.

After Planting the Betty's following the Bomb. You'll Knowtice that You'll Continue Planting the Bomb Even After its Already Been Planted.

You Can do 1 of 2 Things.

You Can A: Continue to Run Around With the Bomb.

or

B: Go Find a Ladder, Climb up it. And,You'll Be Walking Around Without a Weapon!


Ps: I think If You Press The up Button on The D-pad when You Do this, You'll Have No Weapons Either. But im Not sure... Ill Check inna Little while.
----------------------------------------------------------
EDIT:
Apperently according to tdraggin You can Do this Using a Recon Plane aswell.




Be Sure to Rep+ If this Helped.