Being penetrated by 13 men, one after the other
BAM BAM BAM BAM BAM BAM BAM BAM BAM BAM BAM BAM BAM
just like that

In the Medieval Ages there was a period when bakers began cheating the public at such a rate that public outcry reached the ears of several kings. As bread was a daily staple of Medieval life, the bakers knew that they could charge a lot of money for minimal portions of their products. As such, kings levied laws against bakers stating that they were to lower their pricesand keep honest. In fact the common term "A Baker's Dozen" (meaning 13 instead of 12) came from this time period. Any baker caught selling less than an even dozen was strictly and harshly punished. As a result bakers began adding one extra loaf to be certain their count would be correct or even over the amount decreed by law.

Sticking 12 objects up a woman's vagina and sucking out 13

Slang used for smoking 13 rounds of marijuana in a row.

(n.) the act of smoking 13 consequetive bowls of marijuana. A double-entendre; "baker" refers to both the marijuana being burnt and the number traditionally associated with baked goods

The exhausting phenomenon of having thirteen loose bowel evacuations in one 24 hour period. Especially while on holiday in Mexico or in Majorca on your 30th birthday with seven of your mates.

The act of placing all 10 fingers, penis and testicles inside a women at one time. Making a total of 13 individual parts inside her at once, Hence the term Baker's Dozen. This can be done using any of the following oraphaces, mouth, vagina, and or anus simutaniously, in any combination, as long as every thing is inside at the same time.