"Bump" is what ppl use to make a thread go to the top or TTT is also what its called, when a thread starts to go down the list less ppl are likely to post or notice it. So thats why ppl say bump or TTT to make the thread go back up.
And if you want to know what Venting means, its when someone takes a special fish venting tool takes a fish that has a gases in it's swim bladder, takes the tool and puncture the swim bladder at a certain angle allowing the gases to be released and letting the fish go back to it's normal swimming patterns.
Hope this helps and BTW welcome to MFK!