depending on what whathardware or software reverb unit you are using its just a case of using a reverb that you can adjust the pre delay on, set this to the offbeat or whatever sounds best and play with the reverb decay settings to make it punch on the offbeat....i used to just use the basic reverb that came in reason, stick it on the gate setting and put the decay ot about 2'oclock

you can do it the long way in an audio editor by reverbing a kick drum and setting the wet / dry setting to 100% wet so you only get the reverb and none of the original signal...now you are free to play around with the reverb...effect it, distort it - whatever and then save it a sample and trigger it on the offbeat of your kick....this is handy if you use a busy kick pattern which would otherwise swamp the mix with reverb when the kicks bunch up