The word "bog" refers to a wet and muddy area of land, typically containing decomposing plants. It is often characterized by its spongy or soft ground that can make walking difficult. Full definition
It's all about the momentum here to build the speed, and that is where dealing with all the traffic was very important; you didn't get bogged down too much because it would kind of ruin your rhythm. (corvetteracing.com)
Because he was able to make plays on the ground, Seattle's offense didn't bog down too much when he was struggling to complete passes. (sbnation.com)
I recorded a sample with the Smart Headset, then subbed in a pair of bog standard Apple Earpods and the audio effect was exactly the same. (imore.com)