I can't stand my supervisor

[Lindsey]

As you might know, I've been working at this engineering company since January. It's my first job out of college, and I also did my "work term" with this same company, where I worked for 8 months (with pay) to get credit for school. When I worked here before I did lab work, so I was between construction sites and the lab here all week and most weekends doing samping, testing on soils, asphalt, and concrete, just really hands-on kind of stuff. After awhile the work just gets monotonous. It's the same thing every day, you never learn anything new, and there's nowhere to move up. I did like working alone though, just dealing with clients all day and not really being around the office much.
So when they offered me another lab job, I declined, but said I would be more interested in an office-type job where I'd know my hours every day. I can draft and I can design (I just need an engineer to approve my designs first), so that's the job I got. I've mostly just been drafting but I've also touched on a bit of road design. I really don't mind the work, I like it a lot better than being in the lab.
However, my SUPERVISOR is another story. I absolutely can't stand him. Looking at him just makes me feel sick. He has been through two courses on this new program, and I learned it on my own in a month. He asks me basic questions every day, and makes the same mistakes over and over that I have to fix for him. He is MONTHS late for every project he needs to do because he spends probably no more than 2 hours total in front of his computer all day. The rest of the time he walks around talking to people about his life, or stands outside smoking. He's been at work for over an hour this morning and his computer isn't even ON. On Monday I passed 2 projects on to him because I am wayyyy too busy. He had nothing to do. Yesterday afternoon when I was still swamped he threw them on my desk and said "Can you try to work on these too? They have to be done tomorrow." I didn't get a start on them and the engineer came in this morning looking for them So that's what I'm doing now.
His favourite topic of discussion is diarrhea. If anyone is sick ever, he asks if they have diarrhea! One day him and another guy were in here and they were asking about my bike, and I happened to be wearing a skirt. He told me I should ride around in my skirt and get some panties with motorcycles all over them and go for a ride with my skirt flying up and then he was like screaming "WOOHOO!" and I didn't even look back at him. I was fuming.
This company is small, there are only 10-15 people in this office. Anytime anyone has a personal meeting about anything, every word can be heard through the thin walls. I don't know how to bring it up to the boss, or if I should just suck it up and deal with it.