To fire an explosive missile at your feet whilst jumping, the act of which makes you accelerate quickly upwards. You must jump whilst doing this, because otherwise you will not gain much speed upwards and will inflict a lot more damage on yourself. Timing is important.
A mechanic in Team Fortress 2 that allows the soldier class to maneuver great distances at a high speed by shooting rockets at surfaces (floors, walls, props, etc), while sacrificing some health and ammo in order to do so. It is also essential to the process of market gardening, and by extention, Trollgier.
Have you seen some of the top Soldier players do rocket jumping? They go so far so fast!
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”
Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.