<human>: I was working loss prevention. I did nothing seriously wrong to be let go. I didn't steal, or lie, or let people steal. I just didn't try hard enough to keep the job. I was late a couple times, 1 no show no call. Made 1 bad stop, that in the end actually led to a bigger bust. So I was at a -1 for the bad stop, and then a +2 for what happened with the jerkoff a couple weeks later. The job was not very challenging and I generally didn't like it. I was let go at the end of my 6 month probation period.

I was recently hired at a hotel as a security agent. Bosses love me, I love the job, I have set goals to stay with and move up in the company. I completed my probation period and received a very good review. There's great perks along with decent pay. So there is no chance of a repeat performance on my part. 

When I applied, I just did not list the loss prevention job on my application or resume, and did not talk about it during the interview. My military experience, and prior security related jobs more than made my work experience. 

When we're out BS'ing before or after work, the boss and another co-worker talk about their time in loss prevention. I just want to join the conversation just for the purpose of BS'ing, but also not having to hear about it, as if I know nothing about it. 

Should I just never say anything about it? Or since I've passed probation here, and they like me, do you think I'd be at risk of being accused of falsifying my application, and terminated for cause? Is omitting prior unfavorable employment, the same as listing a job which you never worked?

Could you distill the essence of the text into 1-3 sentences?
<bot>: i was essentially fired from a prior job, didn't list it on my application, or talk about it during the interview... is it safe to talk about it now that I am firmly employed?